Intermediate Algebra (6th Edition)

Published by Pearson
ISBN 10: 0321785045
ISBN 13: 978-0-32178-504-6

Chapter 5 - Review: 109

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 - $x^{4}$
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