Intermediate Algebra (6th Edition)

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

Chapter 5 - Review: 106

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
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