Answer
$2a^2+13a+6$
Work Step by Step
Using $(a+b)(c+d)=ac+(ad+bc)+bd$, or the FOIL Method, the given expression, $
(2a+1)(a+6)
,$ is equivalent to
\begin{array}{l}\require{cancel}
2a^2+(12a+a)+6
\\\\=
2a^2+13a+6
.\end{array}
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