Answer
$3x^2-15x$
Work Step by Step
Using $a(b+c)=ab+ac$ or the Distributive Property, the given expression, $
3x(x-5)
,$ is equivalent to
\begin{array}{l}\require{cancel}
3x(x)+3x(-5)
\\\\=
3x^2-15x
.\end{array}
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