Answer
$3a^2+14a+8$
Work Step by Step
Using $(a+b)(c+d)=ac+(ad+bc)+bd$, or the FOIL Method, the given expression, $
(3a+2)(a+4)
,$ is equivalent to
\begin{array}{l}\require{cancel}
3a^2+(12a+2a)+8
\\\\=
3a^2+14a+8
.\end{array}
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