Answer
see explanation
Work Step by Step
If $a=1$, then the expression $
(a+5)^2
$ evaluates to
\begin{array}{l}\require{cancel}
(1+5)^2
\\\\=
(6)^2
\\\\=
36
,\end{array}
and the expression $
a^2+5^2
$ evaluates to
\begin{array}{l}
1^2+5^2
\\\\=
1+25
\\\\=
26
.\end{array}
Hence, $
(a+5)^2
\ne
a^2+5^2
$.
