Answer
$25x^2+20x+4$
Work Step by Step
Using $(a+b)^2=a^2+2ab+b^2$ or the square of a binomial, the square of the given expression, $
(5x+2)^2
,$ is
\begin{array}{l}\require{cancel}
(5x)^2+2(5x)(2)+(2)^2
\\\\=
25x^2+20x+4
.\end{array}
Introductory Algebra for College Students (7th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0-13417-805-X
ISBN 13:
978-0-13417-805-9
Chapter 5 - Section 5.3 - Special Products - Exercise Set - Page 367: 48
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