Calculus: Early Transcendentals 9th Edition

Published by Cengage Learning
ISBN 10: 1337613924
ISBN 13: 978-1-33761-392-7

Chapter 4 - Section 4.9 - Antiderivatives - 4.9 Exercises - Page 362: 17

Answer

$F\left( x \right) = \frac{2}{5}\ln \left| x \right| + \frac{3}{x} + C$

Work Step by Step

$$\eqalign{ & f\left( x \right) = \frac{2}{{5x}} - \frac{3}{{{x^2}}} \cr & {\text{Rewrite the function using property of exponents }}\frac{1}{{{x^n}}} = {x^{ - n}} \cr & f\left( x \right) = \frac{2}{{5x}} - 3{x^{ - 2}} \cr & {\text{Using the formulas in Table 2 }}\left( {{\text{see page 358}}} \right){\text{ }} \cr & {\text{Function: }}cf\left( x \right) \to {\text{Particular antiderivative: }}cF\left( x \right) \cr & {\text{Function: }}{x^n}\left( {n \ne - 1} \right) \to {\text{Particular antiderivative: }}\frac{{{x^{n + 1}}}}{{n + 1}} \cr & {\text{Function: }}\frac{1}{x} \to {\text{Particular antiderivative: }}\ln \left| x \right| \cr & {\text{Function: }}f\left( x \right) + h\left( x \right) \to {\text{Particular antiderivative: }}f\left( x \right) + h\left( x \right) \cr & {\text{And applying the Theorem 1}},{\text{ we obtain}} \cr & F\left( x \right) = \frac{2}{5}\ln \left| x \right| - 3\left( {\frac{{{x^{ - 2 + 1}}}}{{ - 2 + 1}}} \right) + C \cr & F\left( x \right) = \frac{2}{5}\ln \left| x \right| - 3\left( {\frac{{{x^{ - 1}}}}{{ - 1}}} \right) + C \cr & F\left( x \right) = \frac{2}{5}\ln \left| x \right| + \frac{3}{x} + C \cr & \cr & {\text{Checking the answer by differentiation}} \cr & F'\left( x \right) = \frac{d}{{dx}}\left[ {\frac{2}{5}\ln \left| x \right|} \right] + \frac{d}{{dx}}\left[ {\frac{3}{x}} \right] + \frac{d}{{dx}}\left[ C \right] \cr & F'\left( x \right) = \frac{2}{5}\left( {\frac{1}{x}} \right) + 3\left( { - \frac{1}{{{x^2}}}} \right) + 0 \cr & F'\left( x \right) = \frac{2}{{5x}} - \frac{3}{{{x^2}}} \cr} $$
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