Answer
$72n^2-5n-12$
Work Step by Step
Using $(a+b)(c+d)=ac+(ad+bc)+bd$, or the FOIL Method, the given expression, $
(8n+3)(9n-4)
,$ is equivalent to
\begin{array}{l}\require{cancel}
72n^2+(-32n+27n)-12
\\\\=
72n^2-5n-12
.\end{array}
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