Calculus: Early Transcendentals 8th Edition

Published by Cengage Learning
ISBN 10: 1285741552
ISBN 13: 978-1-28574-155-0

Chapter 7 - Section 7.8 - Improper Integrals - 7.8 Exercises - Page 534: 28

Answer

$\displaystyle \frac{3\cdot 5^{2/3}}{2}$ (converges)

Work Step by Step

The integrand has a discontinuity at 5, so this is a type 2.a improper integral. $\displaystyle \int_{a}^{b}f(x)dx=\lim_{t\rightarrow b^{-}}\int_{a}^{t}f(x)dx$ $I=\displaystyle \int_{0}^{5}\frac{1}{\sqrt[3]{5-x}}dx=\lim_{t\rightarrow 5^{-}}\int_{0}^{t}\frac{1}{\sqrt[3]{5-x}}dx$ $\left[\begin{array}{ll} u=5-x & \\ du=-dx & \\ x=0\Rightarrow u=5, & x=5\Rightarrow u=0 \end{array}\right]$ $I=\displaystyle \lim_{u\rightarrow 0^{-}}\int_{-5}^{u}-u^{-1/3}dx=\lim_{u\rightarrow 0^{-}}\left[-\frac{3u^{2/3}}{2}\right]_{-5}^{u}$ $=0-(-\displaystyle \frac{3\cdot 5^{2/3}}{2})$ $=\displaystyle \frac{3\cdot 5^{2/3}}{2}$ (converges)
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