Precalculus: Mathematics for Calculus, 7th Edition

Published by Brooks Cole
ISBN 10: 1305071751
ISBN 13: 978-1-30507-175-9

Chapter 1 - Section 1.3 - Algebraic Expressions - 1.3 Exercises: 110

Answer

$(r-3s)^2$

Work Step by Step

Use the special formula of perfect squares to solve. $r^{2}-6rs+9s^{2}=(r)^{2}-2(3)(r)(s)+(3)^{2}(s)^{2}=(r-3s)^{2}$
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