Answer
$4m^2+28m+49-4mn-14n+n^2$
Work Step by Step
Use the formula $(a-b)^2=a^2-2ab+b^2$ and treat $2m+7$ as a single term, we have:
$[(2m+7)-n]^2=(2m+7)^2-2(2m+7)n+n^2=4m^2+28m+49-4mn-14n+n^2$
Precalculus (6th Edition)
by Lial, Margaret L.; Hornsby, John; Schneider, David I.; Daniels, Callie
Published by
Pearson
ISBN 10:
013421742X
ISBN 13:
978-0-13421-742-0
Chapter R - Review of Basic Concepts - R.3 Polynomials - R.3 Exercises - Page 33: 82
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