Answer
(x-9)(x+9)
Work Step by Step
$x^{2}$-81=$x^{2}$-$9^{2}$=(x-9)(x+9)(
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 6 - Review - Page 474: 33
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