Answer
$(r+3s)^3=r^3+9r^2s+27rs^2+27s^3$
Work Step by Step
$(r+3s)^3=~_3C_0r^3+~_3C_1r^2(3s)^1+~_3C_2r^1(3s)^2+~_3C_0(3s)^3=r^3+3r^2(3s)+3r(9s^2)+27s^3=r^3+9r^2s+27rs^2+27s^3$
Algebra and Trigonometry 10th Edition
by Larson, Ron
Published by
Cengage Learning
ISBN 10:
9781337271172
ISBN 13:
978-1-33727-117-2
Chapter 11 - 11.5 - The Binomial Theorem - 11.5 Exercises - Page 813: 21
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