Algebra: A Combined Approach (4th Edition)

Published by Pearson
ISBN 10: 0321726391
ISBN 13: 978-0-32172-639-1

Chapter 5 - Section 5.6 - Special Products - Practice - Page 384: 4



Work Step by Step

Step 1: $(2x+9)^{2}=(2x+9)(2x+9)$ Step 2: Using the FOIL method, $(2x+9)(2x+9)=(2x)(2x)+(2x)(9)+(9)(2x)+(9)^{2}$ Step 3: $(2x)(2x)+(2x)(9)+(9)(2x)+(9)^{2}$=$4x^{2}+18x+18x+81$ Step 4: $4x^{2}+18x+18x+81=4x^{2}+36x+81$
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