Answer
$x=3,=-3$
Work Step by Step
To solve the equation:
$x^2-9=0$
We first add 9 to both sides:
$x^2-9+9=0+9$
$x^2=9$
To solve for x, we now take the square root of both sides:
$\sqrt{ x^2}=\sqrt 9$
So,
$x=3,=-3$
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter 2 - Section 2.2 - Graphs of Equations in Two Variables; Intercepts; Symmetry - 2.2 Assess Your Understanding - Page 164: 2
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