Answer
(x + 9)(x - 9)
Work Step by Step
$x^{2}$ - 81 = (x + 9)(x - 9)
Check by multiplying factors with FOIL:
x(x) + x(-9) + 9(x) + 9(-9)
= $x^{2}$ - 9x + 9x - 81
= $x^{2}$ - 81
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 5 - Review - Page 331: 106
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