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: 14

Answer

$$Convergent,1-\frac{1}{e}$$

Work Step by Step

$let\ t =-\frac{1}{x},\ dt=\frac{1}{x^{2}}dx$ $\int_{1}^{\infty}\Rightarrow \int_{-1}^{0}$ $$\int_{1}^{\infty}\frac{e^{-1/x}}{x^{2}}dx=\int_{-1}^{0}e^{t}dt$$ $$=\left [ e^{t} \right ]_{-1}^{0}=1-\frac{1}{e}$$ Convergent.
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