Answer
$14x^2-43x-21$
Work Step by Step
Using $(a+b)(c+d)=ac+(ad+bc)+bd$, or the FOIL Method, the given expression, $
(-2x+7)(-7x-3)
,$ is equivalent to
\begin{array}{l}\require{cancel}
14x^2+(6x-49x)-21
\\\\=
14x^2-43x-21
.\end{array}
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