Answer
$ (x^n - 9)(x^n +9)$
Work Step by Step
$x^{2n} - 81= (x^n)^2 - 9^2 = (x^n - 9)(x^n +9)$
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 - Section 6.5 - Factoring by Special Products - Exercise Set - Page 448: 96
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