Answer
$(R-r)(R+r)$
Work Step by Step
This is a difference between two squares, and hence
$$R^2-r^2=(R-r)(R+r).$$
One can check as follows
$$(R-r)(R+r)=R^2-Rr+Rr-r^2=R^2-r^2
.$$
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: 23
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