Calculus: Early Transcendentals 8th Edition

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

Chapter 11 - Review - Exercises - Page 786: 42

Answer

The series has a radius of convergence $\infty$ and interval $\infty$ or $(-\infty, \infty)$.

Work Step by Step

Root test: $R=\lim\limits_{n \to \infty}|\frac{a_{n+1}}{a_{n}}|=|\frac{\frac{2^{n+1}(x-2)^{n+1}}{(n+3)!}}{\frac{2^{n}(x-2)^{n}}{(n+2)!}}|$ $=\lim\limits_{n \to \infty}|\frac{2(x-2)}{n+3)}|$ $=|\frac{2(x-2)}{\infty}|=0\lt 1$ Thus, the series has a radius of convergence $\infty$ and interval $\infty$ or $(-\infty, \infty)$.
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