Answer
$x_{1}$=3 $x_{2}$=-3
Work Step by Step
$x^{2}$-9=0
Add 9 to both sides
$x^{2}$-9+9=0+9
Simplify
$x^{2}$=9
Take the square root of both sides
$\sqrt x^{2}$=$\pm\sqrt 9$
$x_{1}$=3 $x_{2}$=-3
Precalculus (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0-32197-907-9
ISBN 13:
978-0-32197-907-0
Chapter 1 - Graphs - 1.2 Graphs of Equations in Two Variables; Intercepts; Symmetry - 1.2 Assess Your Understanding - Page 16: 2
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