Answer
$(x-9y)^2$
Work Step by Step
$ x^{2}-18xy+81y^2\qquad$...recognize a perfect square trinomial.
$(A\pm B)^{2}=A^{2}\pm 2AB+B^{2}$; $A=x,\ B=9y$
$=(x-9y)^2$
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 6.4 - Factoring Special Forms - Exercise Set - Page 454: 62
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