Calculus: Early Transcendentals 8th Edition

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

Chapter 11 - Section 11.1 - Sequences - 11.1 Exercises: 14

Answer

$$a_n = -\frac{(-1)^n}{4^{n-2}}$$

Work Step by Step

Our first term is $a_1 = 4$. Because the sequence alternates, we have a $(-1)^{n}$ in the sequence. Each term also changes by a factor of $\frac{1}{4}$, so we introduce a factor of $(\frac{1}{4})^n$. Putting together the pieces with the fact that $a_1 = 4$, we have: $$a_n = -\frac{(-1)^n}{4^{n-2}}$$
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