Answer
$a_{n}$ = $-1^{n+1}$ * $4^{2-n}$
Work Step by Step
Our first term is $a_{1}$ = $4$ and gradually gets exponentially smaller. However, the terms also alternate between positive or negative. Thus, we need to factor in a $-1$ term.
Calculus 8th Edition
by Stewart, James
Published by
Cengage
ISBN 10:
1285740629
ISBN 13:
978-1-28574-062-1
Chapter 11 - Infinite Sequences and Series - 11.1 Sequences - 11.1 Exercises - Page 744: 14
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