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<!DOCTYPE html>
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<title>4.8 General Strategy for Solving Optimization Problems | MATH 112: Differential Calculus</title>
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<li><a href="./">M112: Differential Calculus</a></li>
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<li class="chapter" data-level="" data-path="index.html"><a href="index.html"><i class="fa fa-check"></i>Welcome</a></li>
<li class="chapter" data-level="1" data-path="functions-and-models.html"><a href="functions-and-models.html"><i class="fa fa-check"></i><b>1</b> Functions and Models</a>
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<li class="chapter" data-level="1.1" data-path="four-ways-to-represent-a-function.html"><a href="four-ways-to-represent-a-function.html"><i class="fa fa-check"></i><b>1.1</b> Four Ways to Represent a Function</a>
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<li class="chapter" data-level="1.1.1" data-path="four-ways-to-represent-a-function.html"><a href="four-ways-to-represent-a-function.html#four-representations-of-a-function"><i class="fa fa-check"></i><b>1.1.1</b> Four Representations of a Function</a></li>
<li class="chapter" data-level="1.1.2" data-path="four-ways-to-represent-a-function.html"><a href="four-ways-to-represent-a-function.html#piecewise-defined-functions"><i class="fa fa-check"></i><b>1.1.2</b> Piecewise-Defined Functions</a></li>
<li class="chapter" data-level="1.1.3" data-path="four-ways-to-represent-a-function.html"><a href="four-ways-to-represent-a-function.html#symmetry"><i class="fa fa-check"></i><b>1.1.3</b> Symmetry</a></li>
<li class="chapter" data-level="1.1.4" data-path="four-ways-to-represent-a-function.html"><a href="four-ways-to-represent-a-function.html#increasing-and-decreasing-functions"><i class="fa fa-check"></i><b>1.1.4</b> Increasing and Decreasing Functions</a></li>
<li class="chapter" data-level="1.1.5" data-path="four-ways-to-represent-a-function.html"><a href="four-ways-to-represent-a-function.html#putting-it-all-together"><i class="fa fa-check"></i><b>1.1.5</b> Putting it All Together</a></li>
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<li class="chapter" data-level="1.2" data-path="mathematical-models-a-catalog-of-essential-functions.html"><a href="mathematical-models-a-catalog-of-essential-functions.html"><i class="fa fa-check"></i><b>1.2</b> Mathematical Models: A Catalog of Essential Functions</a>
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<li class="chapter" data-level="1.2.1" data-path="mathematical-models-a-catalog-of-essential-functions.html"><a href="mathematical-models-a-catalog-of-essential-functions.html#linear-models"><i class="fa fa-check"></i><b>1.2.1</b> Linear Models</a></li>
<li class="chapter" data-level="1.2.2" data-path="mathematical-models-a-catalog-of-essential-functions.html"><a href="mathematical-models-a-catalog-of-essential-functions.html#polynomial-functions"><i class="fa fa-check"></i><b>1.2.2</b> Polynomial Functions</a></li>
<li class="chapter" data-level="1.2.3" data-path="mathematical-models-a-catalog-of-essential-functions.html"><a href="mathematical-models-a-catalog-of-essential-functions.html#power-functions"><i class="fa fa-check"></i><b>1.2.3</b> Power Functions</a></li>
<li class="chapter" data-level="1.2.4" data-path="mathematical-models-a-catalog-of-essential-functions.html"><a href="mathematical-models-a-catalog-of-essential-functions.html#rational-functions"><i class="fa fa-check"></i><b>1.2.4</b> Rational Functions</a></li>
<li class="chapter" data-level="1.2.5" data-path="mathematical-models-a-catalog-of-essential-functions.html"><a href="mathematical-models-a-catalog-of-essential-functions.html#algebraic-functions"><i class="fa fa-check"></i><b>1.2.5</b> Algebraic Functions</a></li>
<li class="chapter" data-level="1.2.6" data-path="mathematical-models-a-catalog-of-essential-functions.html"><a href="mathematical-models-a-catalog-of-essential-functions.html#trigonometric-functions"><i class="fa fa-check"></i><b>1.2.6</b> Trigonometric Functions</a></li>
<li class="chapter" data-level="1.2.7" data-path="mathematical-models-a-catalog-of-essential-functions.html"><a href="mathematical-models-a-catalog-of-essential-functions.html#exponential-functions"><i class="fa fa-check"></i><b>1.2.7</b> Exponential Functions</a></li>
<li class="chapter" data-level="1.2.8" data-path="mathematical-models-a-catalog-of-essential-functions.html"><a href="mathematical-models-a-catalog-of-essential-functions.html#logarithmic-functions"><i class="fa fa-check"></i><b>1.2.8</b> Logarithmic Functions</a></li>
<li class="chapter" data-level="1.2.9" data-path="mathematical-models-a-catalog-of-essential-functions.html"><a href="mathematical-models-a-catalog-of-essential-functions.html#putting-it-all-together-1"><i class="fa fa-check"></i><b>1.2.9</b> Putting it All Together</a></li>
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<li class="chapter" data-level="1.3" data-path="new-functions-from-old-functions.html"><a href="new-functions-from-old-functions.html"><i class="fa fa-check"></i><b>1.3</b> New Functions from Old Functions</a>
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<li class="chapter" data-level="1.3.1" data-path="new-functions-from-old-functions.html"><a href="new-functions-from-old-functions.html#transformations-of-functions"><i class="fa fa-check"></i><b>1.3.1</b> Transformations of Functions</a></li>
<li class="chapter" data-level="1.3.2" data-path="new-functions-from-old-functions.html"><a href="new-functions-from-old-functions.html#combinations-of-functions"><i class="fa fa-check"></i><b>1.3.2</b> Combinations of Functions</a></li>
<li class="chapter" data-level="1.3.3" data-path="new-functions-from-old-functions.html"><a href="new-functions-from-old-functions.html#putting-it-all-together-2"><i class="fa fa-check"></i><b>1.3.3</b> Putting It All Together</a></li>
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<li class="chapter" data-level="1.4" data-path="exponential-functions-1.html"><a href="exponential-functions-1.html"><i class="fa fa-check"></i><b>1.4</b> Exponential Functions</a>
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<li class="chapter" data-level="1.4.1" data-path="exponential-functions-1.html"><a href="exponential-functions-1.html#graphical-behavior-of-y-bx"><i class="fa fa-check"></i><b>1.4.1</b> Graphical Behavior of <span class="math inline">\(y = b^x\)</span></a></li>
<li class="chapter" data-level="1.4.2" data-path="exponential-functions-1.html"><a href="exponential-functions-1.html#applications-of-exponential-functions"><i class="fa fa-check"></i><b>1.4.2</b> Applications of Exponential Functions</a></li>
<li class="chapter" data-level="1.4.3" data-path="exponential-functions-1.html"><a href="exponential-functions-1.html#the-number-e-and-the-natural-exponential-function"><i class="fa fa-check"></i><b>1.4.3</b> The Number <span class="math inline">\(e\)</span> and the Natural Exponential Function</a></li>
<li class="chapter" data-level="1.4.4" data-path="exponential-functions-1.html"><a href="exponential-functions-1.html#graph-transformations-of-exponentials"><i class="fa fa-check"></i><b>1.4.4</b> Graph Transformations of Exponentials</a></li>
<li class="chapter" data-level="1.4.5" data-path="exponential-functions-1.html"><a href="exponential-functions-1.html#putting-it-all-together-3"><i class="fa fa-check"></i><b>1.4.5</b> Putting It All Together</a></li>
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<li class="chapter" data-level="1.5" data-path="inverse-functions-and-logarithms.html"><a href="inverse-functions-and-logarithms.html"><i class="fa fa-check"></i><b>1.5</b> Inverse Functions and Logarithms</a>
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<li class="chapter" data-level="1.5.1" data-path="inverse-functions-and-logarithms.html"><a href="inverse-functions-and-logarithms.html#graphs-of-inverse-functions"><i class="fa fa-check"></i><b>1.5.1</b> Graphs of Inverse Functions</a></li>
<li class="chapter" data-level="1.5.2" data-path="inverse-functions-and-logarithms.html"><a href="inverse-functions-and-logarithms.html#logarithmic-functions-as-inverses"><i class="fa fa-check"></i><b>1.5.2</b> Logarithmic Functions as Inverses</a></li>
<li class="chapter" data-level="1.5.3" data-path="inverse-functions-and-logarithms.html"><a href="inverse-functions-and-logarithms.html#solving-exponential-and-log-equations"><i class="fa fa-check"></i><b>1.5.3</b> Solving Exponential and Log Equations</a></li>
<li class="chapter" data-level="1.5.4" data-path="inverse-functions-and-logarithms.html"><a href="inverse-functions-and-logarithms.html#inverse-trigonometric-functions"><i class="fa fa-check"></i><b>1.5.4</b> Inverse Trigonometric Functions</a></li>
<li class="chapter" data-level="1.5.5" data-path="inverse-functions-and-logarithms.html"><a href="inverse-functions-and-logarithms.html#pulling-it-all-together"><i class="fa fa-check"></i><b>1.5.5</b> Pulling It All Together</a></li>
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<li class="chapter" data-level="2" data-path="limits-and-derivatives.html"><a href="limits-and-derivatives.html"><i class="fa fa-check"></i><b>2</b> Limits and Derivatives</a>
<ul>
<li class="chapter" data-level="2.1" data-path="the-tangent-and-velocity-problems.html"><a href="the-tangent-and-velocity-problems.html"><i class="fa fa-check"></i><b>2.1</b> The Tangent and Velocity Problems</a>
<ul>
<li class="chapter" data-level="2.1.1" data-path="the-tangent-and-velocity-problems.html"><a href="the-tangent-and-velocity-problems.html#the-tangent-problem"><i class="fa fa-check"></i><b>2.1.1</b> The Tangent Problem</a></li>
<li class="chapter" data-level="2.1.2" data-path="the-tangent-and-velocity-problems.html"><a href="the-tangent-and-velocity-problems.html#tangents-from-experimental-data"><i class="fa fa-check"></i><b>2.1.2</b> Tangents from Experimental Data</a></li>
<li class="chapter" data-level="2.1.3" data-path="the-tangent-and-velocity-problems.html"><a href="the-tangent-and-velocity-problems.html#the-velocity-problem"><i class="fa fa-check"></i><b>2.1.3</b> The Velocity Problem</a></li>
<li class="chapter" data-level="2.1.4" data-path="the-tangent-and-velocity-problems.html"><a href="the-tangent-and-velocity-problems.html#connection-between-tangents-and-velocity"><i class="fa fa-check"></i><b>2.1.4</b> Connection Between Tangents and Velocity</a></li>
<li class="chapter" data-level="2.1.5" data-path="the-tangent-and-velocity-problems.html"><a href="the-tangent-and-velocity-problems.html#putting-it-all-together-4"><i class="fa fa-check"></i><b>2.1.5</b> Putting It All Together</a></li>
<li class="chapter" data-level="2.1.6" data-path="the-tangent-and-velocity-problems.html"><a href="the-tangent-and-velocity-problems.html#conceptual-takeaways-5"><i class="fa fa-check"></i><b>2.1.6</b> Conceptual Takeaways</a></li>
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<li class="chapter" data-level="2.2" data-path="the-limit-of-a-function.html"><a href="the-limit-of-a-function.html"><i class="fa fa-check"></i><b>2.2</b> The Limit of a Function</a>
<ul>
<li class="chapter" data-level="2.2.1" data-path="the-limit-of-a-function.html"><a href="the-limit-of-a-function.html#intuitive-idea-of-a-limit"><i class="fa fa-check"></i><b>2.2.1</b> Intuitive Idea of a Limit</a></li>
<li class="chapter" data-level="2.2.2" data-path="the-limit-of-a-function.html"><a href="the-limit-of-a-function.html#numerical-approach-to-limits"><i class="fa fa-check"></i><b>2.2.2</b> Numerical Approach to Limits</a></li>
<li class="chapter" data-level="2.2.3" data-path="the-limit-of-a-function.html"><a href="the-limit-of-a-function.html#one-sided-limits"><i class="fa fa-check"></i><b>2.2.3</b> One-Sided Limits</a></li>
<li class="chapter" data-level="2.2.4" data-path="the-limit-of-a-function.html"><a href="the-limit-of-a-function.html#infinite-limits"><i class="fa fa-check"></i><b>2.2.4</b> Infinite Limits</a></li>
<li class="chapter" data-level="2.2.5" data-path="the-limit-of-a-function.html"><a href="the-limit-of-a-function.html#vertical-asymptotes"><i class="fa fa-check"></i><b>2.2.5</b> Vertical Asymptotes</a></li>
<li class="chapter" data-level="2.2.6" data-path="the-limit-of-a-function.html"><a href="the-limit-of-a-function.html#putting-it-all-together-5"><i class="fa fa-check"></i><b>2.2.6</b> Putting It All Together</a></li>
</ul></li>
<li class="chapter" data-level="2.3" data-path="calculating-limits-using-the-limit-laws.html"><a href="calculating-limits-using-the-limit-laws.html"><i class="fa fa-check"></i><b>2.3</b> Calculating Limits Using the Limit Laws</a>
<ul>
<li class="chapter" data-level="2.3.1" data-path="calculating-limits-using-the-limit-laws.html"><a href="calculating-limits-using-the-limit-laws.html#limit-laws"><i class="fa fa-check"></i><b>2.3.1</b> Limit Laws</a></li>
<li class="chapter" data-level="2.3.2" data-path="calculating-limits-using-the-limit-laws.html"><a href="calculating-limits-using-the-limit-laws.html#the-squeeze-theorem-sandwich-theorem"><i class="fa fa-check"></i><b>2.3.2</b> The Squeeze Theorem (Sandwich Theorem)</a></li>
<li class="chapter" data-level="2.3.3" data-path="calculating-limits-using-the-limit-laws.html"><a href="calculating-limits-using-the-limit-laws.html#putting-it-all-together-6"><i class="fa fa-check"></i><b>2.3.3</b> Putting It All Together</a></li>
</ul></li>
<li class="chapter" data-level="2.4" data-path="the-precise-definition-of-a-limit.html"><a href="the-precise-definition-of-a-limit.html"><i class="fa fa-check"></i><b>2.4</b> The Precise Definition of a Limit</a></li>
<li class="chapter" data-level="2.5" data-path="continuity.html"><a href="continuity.html"><i class="fa fa-check"></i><b>2.5</b> Continuity</a>
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<li class="chapter" data-level="2.5.1" data-path="continuity.html"><a href="continuity.html#types-of-discontinuities"><i class="fa fa-check"></i><b>2.5.1</b> Types of Discontinuities</a></li>
<li class="chapter" data-level="2.5.2" data-path="continuity.html"><a href="continuity.html#one-sided-continuity"><i class="fa fa-check"></i><b>2.5.2</b> One-Sided Continuity</a></li>
<li class="chapter" data-level="2.5.3" data-path="continuity.html"><a href="continuity.html#composite-functions"><i class="fa fa-check"></i><b>2.5.3</b> Composite Functions</a></li>
<li class="chapter" data-level="2.5.4" data-path="continuity.html"><a href="continuity.html#intermediate-value-theorem-ivt"><i class="fa fa-check"></i><b>2.5.4</b> Intermediate Value Theorem (IVT)</a></li>
<li class="chapter" data-level="2.5.5" data-path="continuity.html"><a href="continuity.html#putting-it-all-together-7"><i class="fa fa-check"></i><b>2.5.5</b> Putting It All Together</a></li>
<li class="chapter" data-level="2.5.6" data-path="continuity.html"><a href="continuity.html#skills-you-should-be-able-to-do-7"><i class="fa fa-check"></i><b>2.5.6</b> Skills You Should Be Able To Do</a></li>
<li class="chapter" data-level="2.5.7" data-path="continuity.html"><a href="continuity.html#problems-6"><i class="fa fa-check"></i><b>2.5.7</b> Problems</a></li>
</ul></li>
<li class="chapter" data-level="2.6" data-path="limits-at-infinity-horizontal-asymptotes.html"><a href="limits-at-infinity-horizontal-asymptotes.html"><i class="fa fa-check"></i><b>2.6</b> Limits at Infinity; Horizontal Asymptotes</a>
<ul>
<li class="chapter" data-level="2.6.1" data-path="limits-at-infinity-horizontal-asymptotes.html"><a href="limits-at-infinity-horizontal-asymptotes.html#limits-at-infinity"><i class="fa fa-check"></i><b>2.6.1</b> Limits at Infinity</a></li>
<li class="chapter" data-level="2.6.2" data-path="limits-at-infinity-horizontal-asymptotes.html"><a href="limits-at-infinity-horizontal-asymptotes.html#infinite-limits-at-infinity"><i class="fa fa-check"></i><b>2.6.2</b> Infinite Limits at Infinity</a></li>
<li class="chapter" data-level="2.6.3" data-path="limits-at-infinity-horizontal-asymptotes.html"><a href="limits-at-infinity-horizontal-asymptotes.html#graph-interpretation"><i class="fa fa-check"></i><b>2.6.3</b> Graph Interpretation</a></li>
<li class="chapter" data-level="2.6.4" data-path="limits-at-infinity-horizontal-asymptotes.html"><a href="limits-at-infinity-horizontal-asymptotes.html#putting-it-all-together-8"><i class="fa fa-check"></i><b>2.6.4</b> Putting It All Together</a></li>
</ul></li>
<li class="chapter" data-level="2.7" data-path="derivatives-and-rates-of-change.html"><a href="derivatives-and-rates-of-change.html"><i class="fa fa-check"></i><b>2.7</b> Derivatives and Rates of Change</a>
<ul>
<li class="chapter" data-level="2.7.1" data-path="derivatives-and-rates-of-change.html"><a href="derivatives-and-rates-of-change.html#tangent-lines-and-limits"><i class="fa fa-check"></i><b>2.7.1</b> Tangent Lines and Limits</a></li>
<li class="chapter" data-level="2.7.2" data-path="derivatives-and-rates-of-change.html"><a href="derivatives-and-rates-of-change.html#derivatives"><i class="fa fa-check"></i><b>2.7.2</b> Derivatives</a></li>
<li class="chapter" data-level="2.7.3" data-path="derivatives-and-rates-of-change.html"><a href="derivatives-and-rates-of-change.html#tangent-line-using-derivatives"><i class="fa fa-check"></i><b>2.7.3</b> Tangent Line Using Derivatives</a></li>
<li class="chapter" data-level="2.7.4" data-path="derivatives-and-rates-of-change.html"><a href="derivatives-and-rates-of-change.html#rates-of-change"><i class="fa fa-check"></i><b>2.7.4</b> Rates of Change</a></li>
<li class="chapter" data-level="2.7.5" data-path="derivatives-and-rates-of-change.html"><a href="derivatives-and-rates-of-change.html#putting-it-all-together-9"><i class="fa fa-check"></i><b>2.7.5</b> Putting It All Together</a></li>
</ul></li>
<li class="chapter" data-level="2.8" data-path="the-derivative-as-a-function.html"><a href="the-derivative-as-a-function.html"><i class="fa fa-check"></i><b>2.8</b> The Derivative as a Function</a>
<ul>
<li class="chapter" data-level="2.8.1" data-path="the-derivative-as-a-function.html"><a href="the-derivative-as-a-function.html#continuity-vs-differentiability"><i class="fa fa-check"></i><b>2.8.1</b> Continuity vs Differentiability</a></li>
<li class="chapter" data-level="2.8.2" data-path="the-derivative-as-a-function.html"><a href="the-derivative-as-a-function.html#higher-derivatives"><i class="fa fa-check"></i><b>2.8.2</b> Higher Derivatives</a></li>
<li class="chapter" data-level="2.8.3" data-path="the-derivative-as-a-function.html"><a href="the-derivative-as-a-function.html#putting-it-all-together-10"><i class="fa fa-check"></i><b>2.8.3</b> Putting It All Together</a></li>
</ul></li>
</ul></li>
<li class="chapter" data-level="3" data-path="differentiation-rules.html"><a href="differentiation-rules.html"><i class="fa fa-check"></i><b>3</b> Differentiation Rules</a>
<ul>
<li class="chapter" data-level="3.1" data-path="derivatives-of-polynomials-and-exponential-functions.html"><a href="derivatives-of-polynomials-and-exponential-functions.html"><i class="fa fa-check"></i><b>3.1</b> Derivatives of Polynomials and Exponential Functions</a>
<ul>
<li class="chapter" data-level="3.1.1" data-path="derivatives-of-polynomials-and-exponential-functions.html"><a href="derivatives-of-polynomials-and-exponential-functions.html#new-derivatives-from-old"><i class="fa fa-check"></i><b>3.1.1</b> New Derivatives from Old</a></li>
<li class="chapter" data-level="3.1.2" data-path="derivatives-of-polynomials-and-exponential-functions.html"><a href="derivatives-of-polynomials-and-exponential-functions.html#exponential-functions-2"><i class="fa fa-check"></i><b>3.1.2</b> Exponential Functions</a></li>
<li class="chapter" data-level="3.1.3" data-path="derivatives-of-polynomials-and-exponential-functions.html"><a href="derivatives-of-polynomials-and-exponential-functions.html#putting-it-all-together-11"><i class="fa fa-check"></i><b>3.1.3</b> Putting It All Together</a></li>
</ul></li>
<li class="chapter" data-level="3.2" data-path="the-product-and-quotient-rules.html"><a href="the-product-and-quotient-rules.html"><i class="fa fa-check"></i><b>3.2</b> The Product and Quotient Rules</a>
<ul>
<li class="chapter" data-level="3.2.1" data-path="the-product-and-quotient-rules.html"><a href="the-product-and-quotient-rules.html#the-product-rule"><i class="fa fa-check"></i><b>3.2.1</b> The Product Rule</a></li>
<li class="chapter" data-level="3.2.2" data-path="the-product-and-quotient-rules.html"><a href="the-product-and-quotient-rules.html#the-quotient-rule"><i class="fa fa-check"></i><b>3.2.2</b> The Quotient Rule</a></li>
<li class="chapter" data-level="3.2.3" data-path="the-product-and-quotient-rules.html"><a href="the-product-and-quotient-rules.html#putting-it-all-together-12"><i class="fa fa-check"></i><b>3.2.3</b> Putting It All Together</a></li>
</ul></li>
<li class="chapter" data-level="3.3" data-path="derivatives-of-trigonometric-functions.html"><a href="derivatives-of-trigonometric-functions.html"><i class="fa fa-check"></i><b>3.3</b> Derivatives of Trigonometric Functions</a>
<ul>
<li class="chapter" data-level="3.3.1" data-path="derivatives-of-trigonometric-functions.html"><a href="derivatives-of-trigonometric-functions.html#putting-it-all-together-13"><i class="fa fa-check"></i><b>3.3.1</b> Putting It All Together</a></li>
</ul></li>
<li class="chapter" data-level="3.4" data-path="the-chain-rule.html"><a href="the-chain-rule.html"><i class="fa fa-check"></i><b>3.4</b> The Chain Rule</a>
<ul>
<li class="chapter" data-level="3.4.1" data-path="the-chain-rule.html"><a href="the-chain-rule.html#putting-it-all-together-14"><i class="fa fa-check"></i><b>3.4.1</b> Putting It All Together</a></li>
</ul></li>
<li class="chapter" data-level="3.5" data-path="implicit-differentiation.html"><a href="implicit-differentiation.html"><i class="fa fa-check"></i><b>3.5</b> Implicit Differentiation</a>
<ul>
<li class="chapter" data-level="3.5.1" data-path="implicit-differentiation.html"><a href="implicit-differentiation.html#horizontal-tangent-condition"><i class="fa fa-check"></i><b>3.5.1</b> Horizontal Tangent Condition</a></li>
<li class="chapter" data-level="3.5.2" data-path="implicit-differentiation.html"><a href="implicit-differentiation.html#inverse-trigonometric-functions-via-implicit-differentiation"><i class="fa fa-check"></i><b>3.5.2</b> Inverse Trigonometric Functions via Implicit Differentiation</a></li>
<li class="chapter" data-level="3.5.3" data-path="implicit-differentiation.html"><a href="implicit-differentiation.html#putting-it-all-together-15"><i class="fa fa-check"></i><b>3.5.3</b> Putting It All Together</a></li>
</ul></li>
<li class="chapter" data-level="3.6" data-path="derivatives-of-logarithmic-functions.html"><a href="derivatives-of-logarithmic-functions.html"><i class="fa fa-check"></i><b>3.6</b> Derivatives of Logarithmic Functions</a>
<ul>
<li class="chapter" data-level="3.6.1" data-path="derivatives-of-logarithmic-functions.html"><a href="derivatives-of-logarithmic-functions.html#logarithmic-differentiation"><i class="fa fa-check"></i><b>3.6.1</b> Logarithmic Differentiation</a></li>
<li class="chapter" data-level="3.6.2" data-path="derivatives-of-logarithmic-functions.html"><a href="derivatives-of-logarithmic-functions.html#putting-it-all-together-16"><i class="fa fa-check"></i><b>3.6.2</b> Putting It All Together</a></li>
</ul></li>
<li class="chapter" data-level="3.7" data-path="rates-of-change-in-the-natural-and-social-sciences.html"><a href="rates-of-change-in-the-natural-and-social-sciences.html"><i class="fa fa-check"></i><b>3.7</b> Rates of Change in the Natural and Social Sciences</a>
<ul>
<li class="chapter" data-level="3.7.1" data-path="rates-of-change-in-the-natural-and-social-sciences.html"><a href="rates-of-change-in-the-natural-and-social-sciences.html#physics-applications"><i class="fa fa-check"></i><b>3.7.1</b> Physics Applications</a></li>
<li class="chapter" data-level="3.7.2" data-path="rates-of-change-in-the-natural-and-social-sciences.html"><a href="rates-of-change-in-the-natural-and-social-sciences.html#physics-density-and-current"><i class="fa fa-check"></i><b>3.7.2</b> Physics: Density and Current</a></li>
<li class="chapter" data-level="3.7.3" data-path="rates-of-change-in-the-natural-and-social-sciences.html"><a href="rates-of-change-in-the-natural-and-social-sciences.html#electric-current"><i class="fa fa-check"></i><b>3.7.3</b> Electric Current</a></li>
<li class="chapter" data-level="3.7.4" data-path="rates-of-change-in-the-natural-and-social-sciences.html"><a href="rates-of-change-in-the-natural-and-social-sciences.html#chemistry-applications"><i class="fa fa-check"></i><b>3.7.4</b> Chemistry Applications</a></li>
<li class="chapter" data-level="3.7.5" data-path="rates-of-change-in-the-natural-and-social-sciences.html"><a href="rates-of-change-in-the-natural-and-social-sciences.html#biology-applications"><i class="fa fa-check"></i><b>3.7.5</b> Biology Applications</a></li>
<li class="chapter" data-level="3.7.6" data-path="rates-of-change-in-the-natural-and-social-sciences.html"><a href="rates-of-change-in-the-natural-and-social-sciences.html#economics-applications"><i class="fa fa-check"></i><b>3.7.6</b> Economics Applications</a></li>
<li class="chapter" data-level="3.7.7" data-path="rates-of-change-in-the-natural-and-social-sciences.html"><a href="rates-of-change-in-the-natural-and-social-sciences.html#putting-it-all-together-17"><i class="fa fa-check"></i><b>3.7.7</b> Putting It All Together</a></li>
</ul></li>
<li class="chapter" data-level="3.8" data-path="exponential-growth-and-decay.html"><a href="exponential-growth-and-decay.html"><i class="fa fa-check"></i><b>3.8</b> Exponential Growth and Decay</a>
<ul>
<li class="chapter" data-level="3.8.1" data-path="exponential-growth-and-decay.html"><a href="exponential-growth-and-decay.html#the-law-of-natural-growth-and-decay"><i class="fa fa-check"></i><b>3.8.1</b> The Law of Natural Growth and Decay</a></li>
<li class="chapter" data-level="3.8.2" data-path="exponential-growth-and-decay.html"><a href="exponential-growth-and-decay.html#population-growth-model"><i class="fa fa-check"></i><b>3.8.2</b> Population Growth Model</a></li>
<li class="chapter" data-level="3.8.3" data-path="exponential-growth-and-decay.html"><a href="exponential-growth-and-decay.html#newtons-law-of-cooling"><i class="fa fa-check"></i><b>3.8.3</b> Newton’s Law of Cooling</a></li>
<li class="chapter" data-level="3.8.4" data-path="exponential-growth-and-decay.html"><a href="exponential-growth-and-decay.html#continuously-compounded-interest"><i class="fa fa-check"></i><b>3.8.4</b> Continuously Compounded Interest</a></li>
<li class="chapter" data-level="3.8.5" data-path="exponential-growth-and-decay.html"><a href="exponential-growth-and-decay.html#putting-it-all-together-18"><i class="fa fa-check"></i><b>3.8.5</b> Putting It All Together</a></li>
</ul></li>
<li class="chapter" data-level="3.9" data-path="related-rates.html"><a href="related-rates.html"><i class="fa fa-check"></i><b>3.9</b> Related Rates</a>
<ul>
<li class="chapter" data-level="3.9.1" data-path="related-rates.html"><a href="related-rates.html#putting-it-all-together-19"><i class="fa fa-check"></i><b>3.9.1</b> Putting It All Together</a></li>
</ul></li>
<li class="chapter" data-level="3.10" data-path="linear-approximations-and-differentials.html"><a href="linear-approximations-and-differentials.html"><i class="fa fa-check"></i><b>3.10</b> Linear Approximations and Differentials</a>
<ul>
<li class="chapter" data-level="3.10.1" data-path="linear-approximations-and-differentials.html"><a href="linear-approximations-and-differentials.html#tangent-line-approximation"><i class="fa fa-check"></i><b>3.10.1</b> Tangent Line Approximation</a></li>
<li class="chapter" data-level="3.10.2" data-path="linear-approximations-and-differentials.html"><a href="linear-approximations-and-differentials.html#differentials"><i class="fa fa-check"></i><b>3.10.2</b> Differentials</a></li>
<li class="chapter" data-level="3.10.3" data-path="linear-approximations-and-differentials.html"><a href="linear-approximations-and-differentials.html#putting-it-all-together-20"><i class="fa fa-check"></i><b>3.10.3</b> Putting It All Together</a></li>
</ul></li>
<li class="chapter" data-level="3.11" data-path="hyperbolic-functions.html"><a href="hyperbolic-functions.html"><i class="fa fa-check"></i><b>3.11</b> Hyperbolic Functions</a></li>
</ul></li>
<li class="chapter" data-level="4" data-path="applications-of-differentiation.html"><a href="applications-of-differentiation.html"><i class="fa fa-check"></i><b>4</b> Applications of Differentiation</a>
<ul>
<li class="chapter" data-level="4.1" data-path="maximum-and-minimum-values.html"><a href="maximum-and-minimum-values.html"><i class="fa fa-check"></i><b>4.1</b> Maximum and Minimum Values</a>
<ul>
<li class="chapter" data-level="4.1.1" data-path="maximum-and-minimum-values.html"><a href="maximum-and-minimum-values.html#types-of-extreme-values"><i class="fa fa-check"></i><b>4.1.1</b> Types of Extreme Values</a></li>
<li class="chapter" data-level="4.1.2" data-path="maximum-and-minimum-values.html"><a href="maximum-and-minimum-values.html#extreme-value-theorem-evt"><i class="fa fa-check"></i><b>4.1.2</b> Extreme Value Theorem (EVT)</a></li>
<li class="chapter" data-level="4.1.3" data-path="maximum-and-minimum-values.html"><a href="maximum-and-minimum-values.html#fermats-theorem"><i class="fa fa-check"></i><b>4.1.3</b> Fermat’s Theorem</a></li>
<li class="chapter" data-level="4.1.4" data-path="maximum-and-minimum-values.html"><a href="maximum-and-minimum-values.html#critical-numbers"><i class="fa fa-check"></i><b>4.1.4</b> Critical Numbers</a></li>
<li class="chapter" data-level="4.1.5" data-path="maximum-and-minimum-values.html"><a href="maximum-and-minimum-values.html#closed-interval-method"><i class="fa fa-check"></i><b>4.1.5</b> Closed Interval Method</a></li>
<li class="chapter" data-level="4.1.6" data-path="maximum-and-minimum-values.html"><a href="maximum-and-minimum-values.html#putting-it-all-together-21"><i class="fa fa-check"></i><b>4.1.6</b> Putting It All Together</a></li>
</ul></li>
<li class="chapter" data-level="4.2" data-path="the-mean-value-theorem.html"><a href="the-mean-value-theorem.html"><i class="fa fa-check"></i><b>4.2</b> The Mean Value Theorem</a>
<ul>
<li class="chapter" data-level="4.2.1" data-path="the-mean-value-theorem.html"><a href="the-mean-value-theorem.html#rolles-theorem"><i class="fa fa-check"></i><b>4.2.1</b> Rolle’s Theorem</a></li>
<li class="chapter" data-level="4.2.2" data-path="the-mean-value-theorem.html"><a href="the-mean-value-theorem.html#the-mean-value-theorem-1"><i class="fa fa-check"></i><b>4.2.2</b> The Mean Value Theorem</a></li>
<li class="chapter" data-level="4.2.3" data-path="the-mean-value-theorem.html"><a href="the-mean-value-theorem.html#consequences-of-the-mean-value-theorem"><i class="fa fa-check"></i><b>4.2.3</b> Consequences of the Mean Value Theorem</a></li>
<li class="chapter" data-level="4.2.4" data-path="the-mean-value-theorem.html"><a href="the-mean-value-theorem.html#putting-it-all-together-22"><i class="fa fa-check"></i><b>4.2.4</b> Putting It All Together</a></li>
</ul></li>
<li class="chapter" data-level="4.3" data-path="how-derivatives-affect-the-shape-of-a-graph.html"><a href="how-derivatives-affect-the-shape-of-a-graph.html"><i class="fa fa-check"></i><b>4.3</b> How Derivatives Affect the Shape of a Graph</a>
<ul>
<li class="chapter" data-level="4.3.1" data-path="how-derivatives-affect-the-shape-of-a-graph.html"><a href="how-derivatives-affect-the-shape-of-a-graph.html#what-does-f-say-about-f"><i class="fa fa-check"></i><b>4.3.1</b> What Does <span class="math inline">\(f'\)</span> Say About <span class="math inline">\(f\)</span>?</a></li>
<li class="chapter" data-level="4.3.2" data-path="how-derivatives-affect-the-shape-of-a-graph.html"><a href="how-derivatives-affect-the-shape-of-a-graph.html#local-extreme-values"><i class="fa fa-check"></i><b>4.3.2</b> Local Extreme Values</a></li>
<li class="chapter" data-level="4.3.3" data-path="how-derivatives-affect-the-shape-of-a-graph.html"><a href="how-derivatives-affect-the-shape-of-a-graph.html#what-does-f-say-about-f-1"><i class="fa fa-check"></i><b>4.3.3</b> What Does <span class="math inline">\(f''\)</span> Say About <span class="math inline">\(f\)</span>?</a></li>
<li class="chapter" data-level="4.3.4" data-path="how-derivatives-affect-the-shape-of-a-graph.html"><a href="how-derivatives-affect-the-shape-of-a-graph.html#inflection-points"><i class="fa fa-check"></i><b>4.3.4</b> Inflection Points</a></li>
<li class="chapter" data-level="4.3.5" data-path="how-derivatives-affect-the-shape-of-a-graph.html"><a href="how-derivatives-affect-the-shape-of-a-graph.html#graph-shape-analysis-framework"><i class="fa fa-check"></i><b>4.3.5</b> Graph Shape Analysis Framework</a></li>
<li class="chapter" data-level="4.3.6" data-path="how-derivatives-affect-the-shape-of-a-graph.html"><a href="how-derivatives-affect-the-shape-of-a-graph.html#putting-it-all-together-23"><i class="fa fa-check"></i><b>4.3.6</b> Putting It All Together</a></li>
</ul></li>
<li class="chapter" data-level="4.4" data-path="indeterminate-forms-and-lhospitals-rule.html"><a href="indeterminate-forms-and-lhospitals-rule.html"><i class="fa fa-check"></i><b>4.4</b> Indeterminate Forms and l’Hospital’s Rule</a>
<ul>
<li class="chapter" data-level="4.4.1" data-path="indeterminate-forms-and-lhospitals-rule.html"><a href="indeterminate-forms-and-lhospitals-rule.html#indeterminate-forms"><i class="fa fa-check"></i><b>4.4.1</b> Indeterminate Forms</a></li>
<li class="chapter" data-level="4.4.2" data-path="indeterminate-forms-and-lhospitals-rule.html"><a href="indeterminate-forms-and-lhospitals-rule.html#interpretation"><i class="fa fa-check"></i><b>4.4.2</b> Interpretation</a></li>
<li class="chapter" data-level="4.4.3" data-path="indeterminate-forms-and-lhospitals-rule.html"><a href="indeterminate-forms-and-lhospitals-rule.html#indeterminate-products-0-cdot-infty"><i class="fa fa-check"></i><b>4.4.3</b> Indeterminate Products <span class="math inline">\(0 \cdot \infty\)</span></a></li>
<li class="chapter" data-level="4.4.4" data-path="indeterminate-forms-and-lhospitals-rule.html"><a href="indeterminate-forms-and-lhospitals-rule.html#indeterminate-differences-infty---infty"><i class="fa fa-check"></i><b>4.4.4</b> Indeterminate Differences <span class="math inline">\(\infty - \infty\)</span></a></li>
<li class="chapter" data-level="4.4.5" data-path="indeterminate-forms-and-lhospitals-rule.html"><a href="indeterminate-forms-and-lhospitals-rule.html#indeterminate-powers"><i class="fa fa-check"></i><b>4.4.5</b> Indeterminate Powers</a></li>
<li class="chapter" data-level="4.4.6" data-path="indeterminate-forms-and-lhospitals-rule.html"><a href="indeterminate-forms-and-lhospitals-rule.html#putting-it-all-together-24"><i class="fa fa-check"></i><b>4.4.6</b> Putting It All Together</a></li>
</ul></li>
<li class="chapter" data-level="4.5" data-path="summary-of-curve-sketching.html"><a href="summary-of-curve-sketching.html"><i class="fa fa-check"></i><b>4.5</b> Summary of Curve Sketching</a>
<ul>
<li class="chapter" data-level="4.5.1" data-path="summary-of-curve-sketching.html"><a href="summary-of-curve-sketching.html#a-structured-framework-for-sketching-curves"><i class="fa fa-check"></i><b>4.5.1</b> A Structured Framework for Sketching Curves</a></li>
<li class="chapter" data-level="4.5.2" data-path="summary-of-curve-sketching.html"><a href="summary-of-curve-sketching.html#putting-it-all-together-25"><i class="fa fa-check"></i><b>4.5.2</b> Putting It All Together</a></li>
</ul></li>
<li class="chapter" data-level="4.6" data-path="graphing-with-calculus-and-calculators.html"><a href="graphing-with-calculus-and-calculators.html"><i class="fa fa-check"></i><b>4.6</b> Graphing with Calculus and Calculators</a></li>
<li class="chapter" data-level="4.7" data-path="optimization-problems.html"><a href="optimization-problems.html"><i class="fa fa-check"></i><b>4.7</b> Optimization Problems</a></li>
<li class="chapter" data-level="4.8" data-path="general-strategy-for-solving-optimization-problems.html"><a href="general-strategy-for-solving-optimization-problems.html"><i class="fa fa-check"></i><b>4.8</b> General Strategy for Solving Optimization Problems</a>
<ul>
<li class="chapter" data-level="4.8.1" data-path="general-strategy-for-solving-optimization-problems.html"><a href="general-strategy-for-solving-optimization-problems.html#step-1-understand-the-problem"><i class="fa fa-check"></i><b>4.8.1</b> Step 1: Understand the Problem</a></li>
<li class="chapter" data-level="4.8.2" data-path="general-strategy-for-solving-optimization-problems.html"><a href="general-strategy-for-solving-optimization-problems.html#step-2-draw-a-diagram"><i class="fa fa-check"></i><b>4.8.2</b> Step 2: Draw a Diagram</a></li>
<li class="chapter" data-level="4.8.3" data-path="general-strategy-for-solving-optimization-problems.html"><a href="general-strategy-for-solving-optimization-problems.html#step-3-introduce-notation"><i class="fa fa-check"></i><b>4.8.3</b> Step 3: Introduce Notation</a></li>
<li class="chapter" data-level="4.8.4" data-path="general-strategy-for-solving-optimization-problems.html"><a href="general-strategy-for-solving-optimization-problems.html#step-4-write-the-objective-function"><i class="fa fa-check"></i><b>4.8.4</b> Step 4: Write the Objective Function</a></li>
<li class="chapter" data-level="4.8.5" data-path="general-strategy-for-solving-optimization-problems.html"><a href="general-strategy-for-solving-optimization-problems.html#step-5-reduce-to-one-variable"><i class="fa fa-check"></i><b>4.8.5</b> Step 5: Reduce to One Variable</a></li>
<li class="chapter" data-level="4.8.6" data-path="general-strategy-for-solving-optimization-problems.html"><a href="general-strategy-for-solving-optimization-problems.html#step-6-optimize-using-calculus"><i class="fa fa-check"></i><b>4.8.6</b> Step 6: Optimize Using Calculus</a></li>
</ul></li>
</ul></li>
<li class="chapter" data-level="5" data-path="worked-examples.html"><a href="worked-examples.html"><i class="fa fa-check"></i><b>5</b> Worked Examples</a>
<ul>
<li class="chapter" data-level="5.1" data-path="example-1-maximum-area-with-fixed-fencing.html"><a href="example-1-maximum-area-with-fixed-fencing.html"><i class="fa fa-check"></i><b>5.1</b> Example 1: Maximum Area with Fixed Fencing</a>
<ul>
<li class="chapter" data-level="5.1.1" data-path="example-1-maximum-area-with-fixed-fencing.html"><a href="example-1-maximum-area-with-fixed-fencing.html#model"><i class="fa fa-check"></i><b>5.1.1</b> Model</a></li>
<li class="chapter" data-level="5.1.2" data-path="example-1-maximum-area-with-fixed-fencing.html"><a href="example-1-maximum-area-with-fixed-fencing.html#optimization"><i class="fa fa-check"></i><b>5.1.2</b> Optimization</a></li>
<li class="chapter" data-level="5.1.3" data-path="example-1-maximum-area-with-fixed-fencing.html"><a href="example-1-maximum-area-with-fixed-fencing.html#solution"><i class="fa fa-check"></i><b>5.1.3</b> Solution</a></li>
</ul></li>
<li class="chapter" data-level="5.2" data-path="example-2-minimum-cost-cylinder.html"><a href="example-2-minimum-cost-cylinder.html"><i class="fa fa-check"></i><b>5.2</b> Example 2: Minimum Cost Cylinder</a>
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<li class="chapter" data-level="5.2.1" data-path="example-2-minimum-cost-cylinder.html"><a href="example-2-minimum-cost-cylinder.html#model-1"><i class="fa fa-check"></i><b>5.2.1</b> Model</a></li>
<li class="chapter" data-level="5.2.2" data-path="example-2-minimum-cost-cylinder.html"><a href="example-2-minimum-cost-cylinder.html#optimization-1"><i class="fa fa-check"></i><b>5.2.2</b> Optimization</a></li>
<li class="chapter" data-level="5.2.3" data-path="example-2-minimum-cost-cylinder.html"><a href="example-2-minimum-cost-cylinder.html#result"><i class="fa fa-check"></i><b>5.2.3</b> Result</a></li>
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<li class="chapter" data-level="5.3" data-path="example-3-closest-point-on-a-curve.html"><a href="example-3-closest-point-on-a-curve.html"><i class="fa fa-check"></i><b>5.3</b> Example 3: Closest Point on a Curve</a>
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<li class="chapter" data-level="5.3.1" data-path="example-3-closest-point-on-a-curve.html"><a href="example-3-closest-point-on-a-curve.html#solution-1"><i class="fa fa-check"></i><b>5.3.1</b> Solution</a></li>
</ul></li>
<li class="chapter" data-level="5.4" data-path="example-4-time-minimization-boat-and-running-problem.html"><a href="example-4-time-minimization-boat-and-running-problem.html"><i class="fa fa-check"></i><b>5.4</b> Example 4: Time Minimization (Boat and Running Problem)</a>
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<li class="chapter" data-level="5.4.1" data-path="example-4-time-minimization-boat-and-running-problem.html"><a href="example-4-time-minimization-boat-and-running-problem.html#solution-2"><i class="fa fa-check"></i><b>5.4.1</b> Solution</a></li>
</ul></li>
<li class="chapter" data-level="5.5" data-path="example-5-maximum-rectangle-in-a-semicircle.html"><a href="example-5-maximum-rectangle-in-a-semicircle.html"><i class="fa fa-check"></i><b>5.5</b> Example 5: Maximum Rectangle in a Semicircle</a>
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<li class="chapter" data-level="5.5.1" data-path="example-5-maximum-rectangle-in-a-semicircle.html"><a href="example-5-maximum-rectangle-in-a-semicircle.html#maximum-area"><i class="fa fa-check"></i><b>5.5.1</b> Maximum Area</a></li>
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<li class="chapter" data-level="6" data-path="applications-in-business-and-economics.html"><a href="applications-in-business-and-economics.html"><i class="fa fa-check"></i><b>6</b> Applications in Business and Economics</a>
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<li class="chapter" data-level="6.1" data-path="example-revenue-maximization.html"><a href="example-revenue-maximization.html"><i class="fa fa-check"></i><b>6.1</b> Example: Revenue Maximization</a>
<ul>
<li class="chapter" data-level="6.1.1" data-path="example-revenue-maximization.html"><a href="example-revenue-maximization.html#solution-3"><i class="fa fa-check"></i><b>6.1.1</b> Solution</a></li>
</ul></li>
</ul></li>
<li class="chapter" data-level="7" data-path="putting-it-all-together-26.html"><a href="putting-it-all-together-26.html"><i class="fa fa-check"></i><b>7</b> Putting It All Together</a>
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<li class="chapter" data-level="7.1" data-path="conceptual-takeaways-27.html"><a href="conceptual-takeaways-27.html"><i class="fa fa-check"></i><b>7.1</b> Conceptual Takeaways</a></li>
<li class="chapter" data-level="7.2" data-path="skills-you-should-be-able-to-do-26.html"><a href="skills-you-should-be-able-to-do-26.html"><i class="fa fa-check"></i><b>7.2</b> Skills You Should Be Able to Do</a></li>
<li class="chapter" data-level="7.3" data-path="newtons-method.html"><a href="newtons-method.html"><i class="fa fa-check"></i><b>7.3</b> Newton’s Method</a></li>
<li class="chapter" data-level="7.4" data-path="antiderivatives.html"><a href="antiderivatives.html"><i class="fa fa-check"></i><b>7.4</b> Antiderivatives</a></li>
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<i class="fa fa-circle-o-notch fa-spin"></i><a href="./">MATH 112: Differential Calculus</a>
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<div id="general-strategy-for-solving-optimization-problems" class="section level2 hasAnchor" number="4.8">
<h2><span class="header-section-number">4.8</span> General Strategy for Solving Optimization Problems<a href="general-strategy-for-solving-optimization-problems.html#general-strategy-for-solving-optimization-problems" class="anchor-section" aria-label="Anchor link to header"></a></h2>
<div id="step-1-understand-the-problem" class="section level3 hasAnchor" number="4.8.1">
<h3><span class="header-section-number">4.8.1</span> Step 1: Understand the Problem<a href="general-strategy-for-solving-optimization-problems.html#step-1-understand-the-problem" class="anchor-section" aria-label="Anchor link to header"></a></h3>
<p>Identify:
- What quantity is being optimized (maximize or minimize)
- What quantities are known
- What constraints are given</p>
<hr />
</div>
<div id="step-2-draw-a-diagram" class="section level3 hasAnchor" number="4.8.2">
<h3><span class="header-section-number">4.8.2</span> Step 2: Draw a Diagram<a href="general-strategy-for-solving-optimization-problems.html#step-2-draw-a-diagram" class="anchor-section" aria-label="Anchor link to header"></a></h3>
<p>Visualize the situation and label known and unknown quantities.</p>
<hr />
</div>
<div id="step-3-introduce-notation" class="section level3 hasAnchor" number="4.8.3">
<h3><span class="header-section-number">4.8.3</span> Step 3: Introduce Notation<a href="general-strategy-for-solving-optimization-problems.html#step-3-introduce-notation" class="anchor-section" aria-label="Anchor link to header"></a></h3>
<p>Let:
- <span class="math inline">\(Q\)</span> = quantity to optimize<br />
- <span class="math inline">\(x, y, r, h, \dots\)</span> = variables representing dimensions or quantities</p>
<p>Use meaningful symbols:
- <span class="math inline">\(A\)</span> for area<br />
- <span class="math inline">\(V\)</span> for volume<br />
- <span class="math inline">\(C\)</span> for cost<br />
- <span class="math inline">\(T\)</span> for time<br />
- <span class="math inline">\(R\)</span> for revenue</p>
<hr />
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<div id="step-4-write-the-objective-function" class="section level3 hasAnchor" number="4.8.4">
<h3><span class="header-section-number">4.8.4</span> Step 4: Write the Objective Function<a href="general-strategy-for-solving-optimization-problems.html#step-4-write-the-objective-function" class="anchor-section" aria-label="Anchor link to header"></a></h3>
<p>Express the quantity <span class="math inline">\(Q\)</span> in terms of the variables:
<span class="math display">\[
Q = f(x,y,\dots)
\]</span></p>
<hr />
</div>
<div id="step-5-reduce-to-one-variable" class="section level3 hasAnchor" number="4.8.5">
<h3><span class="header-section-number">4.8.5</span> Step 5: Reduce to One Variable<a href="general-strategy-for-solving-optimization-problems.html#step-5-reduce-to-one-variable" class="anchor-section" aria-label="Anchor link to header"></a></h3>
<p>Use constraints to eliminate variables so that:
<span class="math display">\[
Q = f(x)
\]</span>
Also determine the <strong>domain</strong> of <span class="math inline">\(x\)</span> from physical or contextual restrictions.</p>
<hr />
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<div id="step-6-optimize-using-calculus" class="section level3 hasAnchor" number="4.8.6">
<h3><span class="header-section-number">4.8.6</span> Step 6: Optimize Using Calculus<a href="general-strategy-for-solving-optimization-problems.html#step-6-optimize-using-calculus" class="anchor-section" aria-label="Anchor link to header"></a></h3>
<ul>
<li>Compute <span class="math inline">\(f'(x)\)</span></li>
<li>Find critical points</li>
<li>Apply:
<ul>
<li>Closed Interval Method (if domain is closed)</li>
<li>First Derivative Test</li>
<li>Behavior at boundaries</li>
</ul></li>
<li>Identify absolute maxima or minima</li>
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