Answer
$a^4*c^8/b^6$
Work Step by Step
$(a^{-2}*b^3*c^{-4})^{-2}$
$(b^3/a^2c^4)^{-2}$
$1/(b^3/a^2c^4)^2)$
$1/(b^6/a^4c^8)$
$(a^4c^8)*1/(a^4c^8)*(b^6/a^4c^8)$
$a^4*c^8/b^6$
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