Answer
$\dfrac{15}{x^4}$
Work Step by Step
Using the laws of exponents, the given expression, $
(5x^{-7})(3x^3)
,$ simplifies to
\begin{array}{l}\require{cancel}
5(3)x^{-7+3}
\\\\=
15x^{-4}
\\\\=
\dfrac{15}{x^4}
.\end{array}
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