Answer
$\dfrac{1}{x^2}$
Work Step by Step
Using the laws of exponents, the given expression, $
\dfrac{x^{-6}}{x^{-4}}
,$ simplifies to
\begin{array}{l}\require{cancel}
x^{-6-(-4)}
\\\\=
x^{-6+4}
\\\\=
x^{-2}
\\\\=
\dfrac{1}{x^2}
.\end{array}