Answer
9$s^{2}$+54s+81
Work Step by Step
Formula: $(a+b)^{2}$=$a^{2}$+2ab+$b^{2}$
We substitute the values in the formula and simplify:
$(3s+9)^{2}$=$3s^{2}$+(2)(3s)(9)+$9^{2}$
=3$s^{2}$+54s+81
Algebra 1: Common Core (15th Edition)
by Charles, Randall I.
Published by
Prentice Hall
ISBN 10:
0133281140
ISBN 13:
978-0-13328-114-9
Chapter 8 - Polynomials and Factoring - 8-4 Multiplying Soecial Cases - Practice and Problem-Solving Exercises - Page 507: 11
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