Answer
$6x^2-21x$
Work Step by Step
Using $a(b+c)=ab+ac$ or the Distributive Property, the given expression, $
3x(2x-7)
$, is equivalent to
\begin{array}{l}\require{cancel}
3x(2x)+3x(-7)
\\\\=
6x^2-21x
.\end{array}
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