Answer
$\pm9$.
Work Step by Step
The given expression is
$= \pm\sqrt{81}$
Use $81=9^2$.
$=\pm \sqrt{9^2}$
Simplify.
$=\pm9$.
Big Ideas Math - Algebra 1, A Common Core Curriculum
by Larson, Ron; Boswell, Laurie
Published by
Big Ideas Learning LLC
ISBN 10:
978-1-60840-838-2
ISBN 13:
978-1-60840-838-2
Chapter 7 - Polynomial Equations and Factoring - 7.6 - Factoring ax^2 + bx + c = 0 - Exercises - Page 396: 52
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