Answer
$9x(x-1)(x+1)$
Work Step by Step
$ 9x^{3}-9x\qquad$...factor out the GCF, $9x$.
$=9x(x^{2}-1)\qquad$...recognize the difference of two squares: $a^{2}-b^{2}=(a-b)(a+b)$
$=9x(x-1)(x+1)$
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 6 - Section 6.5 - A General Factoring Strategy - Exercise Set - Page 462: 46
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