Calculus 10th Edition

Published by Brooks Cole
ISBN 10: 1-28505-709-0
ISBN 13: 978-1-28505-709-5

Chapter 8 - Integration Techniques, L'Hopital's Rule, and Improper Integrals - 8.8 Exercises - Page 576: 53

Answer

Diverges

Work Step by Step

An improper integral converges if the limit exists and is finite. The lower integration limit, 0, makes this integral improper. Replace 0 with variable $t$ and find the limit of the integral. $\int_{0}^{1} \frac{1}{x^{5}}dx$ = $\lim\limits_{t \to 0} \int_{t}^{1}\frac{1}{x^{5}}dx$ Use the power rule $\int x^n \,dx = \frac{x^{n+1}}{n+1} + C$ to integrate: = $\lim\limits_{t \to 0} \frac{-1}{4x^{4}}\Big|_t^1$ Evaluate the limit: = $\lim\limits_{t \to 0} \frac{-1}{4}+\frac{1}{4t^{4}}$ = $\frac{-1}{4} + \infty$ = $\infty$ The limit of this integral is not finite, so this integral diverges.
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