Algebra and Trigonometry 10th Edition

Published by Cengage Learning
ISBN 10: 9781337271172
ISBN 13: 978-1-33727-117-2

Chapter 11 - 11.2 - Arithmetic Sequences and Partial Sums - 11.2 Exercises - Page 786: 17


See below.

Work Step by Step

Plugging in the different values: $a_1=(-1)^1=-1$ $a_2=(-1)^2=1$ $a_3=(-1)^3=-1$ $a_4=(-1)^4=1$ $a_5=(-1)^5=-1$ $a_5-a_4=-1-1=-2\ne a_4-a_3=1-(-1)=2$, thus this is not an arithmetic sequence.
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