Answer
(2x+9)(2x-9)
Work Step by Step
4$x^{2}$-81=$(2x)^{2}$-$9^{2}$=(2x+9)(2x-9)
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 6 - Review - Page 476: 85
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