Answer
$ s = \pm 13 $
Work Step by Step
$s^2 = 169$
Take the square root of both sides to find:
$s = \pm \sqrt {169} = \pm 13 $
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 4 Quadratic Functions and Factoring - 4.5 Solve Quadratic Equations by Finding Square Roots - 4.5 Exercises - Skill Practice - Page 270: 22
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