Answer
$49+84y+36y^2$
Work Step by Step
Using $(a+b)^2=a^2+2ab+b^2$, or the square of a binomial, the given expression, $
(7+6y)^2
,$ is equivalent to
\begin{array}{l}\require{cancel}
(7)^2+2(7)(6y)+(6y)^2
\\\\=
49+84y+36y^2
.\end{array}
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