Answer
$\color{blue}{36r^2-60r+25}$
Work Step by Step
Use the formula $(a-b)^2=a^2-2ab+b^2$ with $a=6r$ and $b=5$ to obtain:
$=(6r)^2-2(6r)(5)+5^2
\\=\color{blue}{36r^2-60r+25}$
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 - Test - Page 85: 10
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