Answer
$(5x-9y)(5x+9y)$
Work Step by Step
Factoring the difference of two squares, we have
$$
25x^2-81y^2=(5x-9y)(5x+9y)
.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 10 - Review - Page 358: 28
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