Thinking Mathematically (6th Edition)

Published by Pearson
ISBN 10: 0321867327
ISBN 13: 978-0-32186-732-2

Chapter 5 - Number Theory and the Real Number System - 5.7 Arithmetic and Geometric Sequences - Exercise Set 5.7: 109

Answer

(i) The sequence is geometric. (ii) The next two terms are: $7$ and $-7$.

Work Step by Step

A sequence is: (a) arithmetic if there is a common difference among the terms.(b) geometric if there is a common ratio among the terms. Notice that in the given sequence: $-7 \div 7 = -1 \\7 \div -7 = -1$ This means that the sequence has a common ratio of $-1$. Thus, the sequence is $\underline{\text{geometric}}$. The next two terms can be found by multiplying $-1$ to the previous term. Therefore, the next two terms are: $-7 \times -1 = 7 \\7 \times -1 = -7$
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