Answer
$\frac{b^{2}}{a^{4}c^{6}}$
Work Step by Step
We are given the expression $a^{-4}b^{2}c^{-6}$.
$a^{-4}\times b^{2}\times c^{-6}=\frac{1}{a^{4}}\times b^{2}\times\frac{1}{c^{6}}=\frac{b^{2}}{a^{4}c^{6}}$
In general, $x^{−b}=\frac{1}{x^{b}}$, for some number x.