Answer
$(x-3)(x+3)(x^{2}+9)$
Work Step by Step
We factor:
$x^{4}-81=(x^{2})^{2}-9^{2}=(x^{2}-9)(x^{2}+9)
=(x-3)(x+3)(x^{2}+9)$
College Algebra (10th Edition)
by Sullivan, Michael
Published by
Pearson
ISBN 10:
0321979478
ISBN 13:
978-0-32197-947-6
Chapter R - Section R.5 - Factoring Polynomials - R.5 Exercises - Page 58: 101
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