Answer
$81r^2-18rs+s^2-4$
Work Step by Step
Use the formula $(a+b)(a-b)=a^2-b^2$ and treat $9r-s$ as a single term, we have:
$[(9r-s)+2][(9r-s)-2]=(9r-s)^2-2^2=81r^2-18rs+s^2-4$
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: 80
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