Answer
$(r-3s)^2$
Work Step by Step
Use the special formula of perfect squares to solve.
$r^{2}-6rs+9s^{2}=(r)^{2}-2(3)(r)(s)+(3)^{2}(s)^{2}=(r-3s)^{2}$
Precalculus: Mathematics for Calculus, 7th Edition
by Stewart, James; Redlin, Lothar; Watson, Saleem
Published by
Brooks Cole
ISBN 10:
1305071751
ISBN 13:
978-1-30507-175-9
Chapter 1 - Section 1.3 - Algebraic Expressions - 1.3 Exercises - Page 34: 110
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