Answer
$(7x-5)(7x+5)$
Work Step by Step
This is a difference between two squares, and hence
$$49x^2-25=(7x-5)(7x+5).$$
One can check as follows
$$(7x-5)(7x+5)=49x^2-35x+35x-25=49x^2-25
.$$
Elementary Technical Mathematics
by Nelson, Robert; Eren, Dale;
Published by
Brooks Cole
ISBN 10:
1285199197
ISBN 13:
978-1-28519-919-1
Chapter 10 - Section 10.5 - Finding Factors of Special Products - Exercise - Page 354: 25
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