Answer
$25x^{2}+90x+81$
Work Step by Step
$(5x+9)^{2}$
Apply the formula for squaring a binomial, which is $(a+b)^{2}=a^{2}+2ab+b^{2}$
Here, $a=5x$ and $b=9$
$(5x+9)^{2}=(5x)^{2}+2(5x)(9)+9^{2}=25x^{2}+90x+81$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 5 - Section 5.6 - Special Products - Exercise Set - Page 387: 31
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