Answer
$x=-9,9$
Work Step by Step
$x^2-9=0$
factor...
$(x+9)(x-9)=0$
$x+9=0$
$x=-9$
$x-9=0$
$x=9$
Precalculus (6th Edition) Blitzer
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13446-914-3
ISBN 13:
978-0-13446-914-0
Chapter P - Review Exercises - Page 144: 132
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