Answer
$-9x^2+9x+4$
Work Step by Step
Using $(a+b)(c+d)=ac+(ad+bc)+bd$, or the FOIL Method, the given expression, $
(-3x-1)(3x-4)
,$ is equivalent to
\begin{array}{l}\require{cancel}
-9x^2+(12x-3x)+4
\\\\=
-9x^2+9x+4
.\end{array}
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