Answer
$x^2+10x+25$
Work Step by Step
Using $(a+b)^2=a^2+2ab+b^2$ (or the square of a binomial), the given expression, $
(x+5)^2
,$ is equivalent to
\begin{array}{l}\require{cancel}
(x)^2+2(x)(5)+(5)^2
\\\\=
x^2+10x+25
.\end{array}
Intermediate Algebra (6th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321785045
ISBN 13:
978-0-32178-504-6
Chapter 11 - Section 11.4 - Partial Sums of Arithmetic and Geometric Sequences - Exercise Set - Page 660: 53
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