Answer
(9 + $x^{2}$)(9 - $x^{2}$)
Work Step by Step
81 - $x^{4}$ = (9 + $x^{2}$)(9 - $x^{2}$)
Check by multiplying factors with FOIL:
9(9) + 9(-$x^{2}$) + $x^{2}$(9) + $x^{2}$(-$x^{2}$)
=81 - 9$x^{2}$ + 9$x^{2}$ - $x^{4}$
= 81 - $x^{4}$
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: 109
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