Answer
$n^2+18n+72$
Work Step by Step
Using $(a+b)(c+d)=ac+(ad+bc)+bd$, or the FOIL Method, the given expression, $
(n+6)(n+12)
,$ is equivalent to
\begin{array}{l}\require{cancel}
n^2+(12n+6n)+72
\\\\=
n^2+18n+72
.\end{array}
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