College Algebra (11th Edition)

Published by Pearson
ISBN 10: 0321671791
ISBN 13: 978-0-32167-179-0

Chapter 7 - Section 7.2 - Arithmetic Sequences and Series - 7.2 Exercises - Page 645: 4



Work Step by Step

$\bf{\text{Solution Outline:}}$ To find the common difference of the given arithmetic sequence, $ -8,-12,-16,-20,... ,$ subtract a term by its previous term. $\bf{\text{Solution Details:}}$ Since the common difference of an arithmetic sequence is the difference between a term and its previous term, then with $a_2= -12 $ and $a_1= -8 $, the common difference, $d$, is \begin{array}{l}\require{cancel} d=-12-(-8) \\\\ d=-12+8 \\\\ d=-4 .\end{array}
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