Answer
$12a^2-7a-12$
Work Step by Step
Using $(a+b)(c+d)=ab+(ad+bc)+bd$, or the FOIL Method, the given expression, $ (4a+3)(3a-4) ,$ is equivalent to \begin{array}{l}\require{cancel} 12a^2+(-16a+9a)-12 \\\\=
12a^2-7a-12
.\end{array}
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