Answer
$x^2+4x+4$
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, $
(x+2)^2
,$ is
\begin{array}{l}\require{cancel}
(x)^2+2(x)(2)+(2)^2
\\\\=
x^2+4x+4
.\end{array}
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