Answer
$\dfrac{8}{a^{15}}$
Work Step by Step
Using the laws of exponents, the given expression, $
(2a^{-5})^{3}
$, is equivalent to
\begin{array}{l}
2^{3}a^{-5(3)}
\\\\=
8a^{-15}
\\\\=
\dfrac{8}{a^{15}}
.\end{array}
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