Answer
$s=\pm i\sqrt{3}$
Work Step by Step
$ s^{2}+12=9\qquad$ ...add $-12$ to each side of the expression.
$ s^{2}=-3\qquad$ ...take square roots of each side.
$ s=\pm\sqrt{-3}\qquad$ ...write in terms of $i$.
$s=\pm i\sqrt{3}$
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 - 4.7 Complete the Square - 4.7 Exercises - Quiz for Lessons 4.5-4.7 - Page 291: 5
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