Calculus: Early Transcendentals 9th Edition

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

Chapter 11 - Section 11.1 - Sequences - 11.1 Exercises - Page 735: 11

Answer

$-1,\frac{2}{3},-\frac{1}{3},\frac{2}{15},-\frac{2}{45}$

Work Step by Step

$a_{n}=\frac{(-2)^{n}}{(n+1)!}$ Substitute $1,2,3,4,5$ to $n$: $a_{1}=\frac{(-2)^{1}}{(1+1)!}=\frac{-2}{2\times1}=-1$ $a_{2}=\frac{(-2)^{2}}{(2+1)!}=\frac{4}{3\times2\times1}=\frac{2}{3}$ $a_{3}=\frac{(-2)^{3}}{(3+1)!}=\frac{-8}{4\times3\times2\times1}=-\frac{1}{3}$ $a_{4}=\frac{(-2)^{4}}{(4+1)!}=\frac{16}{5\times4\times3\times2\times1}=\frac{2}{15}$ $a_{5}=\frac{(-2)^{5}}{(5+1)!}=\frac{-32}{6\times5\times4\times3\times2\times1}=-\frac{2}{45}$
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