Answer
$m^{2}-n^{2}$
Work Step by Step
Given : $(m+n)(m-n)$
This becomes : $m(m) - m(n) + n(m) -n(n)$
(Using distributive property)
$= m^{2}-mn+mn-n^{2}$
$= m^{2}-n^{2}$
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 11 - Rational Expressions and Functions - 11-4 Adding and Subtracting Rational Expressions - Practice and Problem-Solving Exercises - Page 687: 23
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