Answer
$c^8$
Work Step by Step
Use the rule $a^{-m} =\dfrac{1}{a^m}$ to obtain:
$\dfrac{1}{c^{-8}}=\dfrac{1}{\frac{1}{c^8}}$
Use the rule $\frac{a}{b} \div \frac{c}{d}=\frac{a}{b} \times \frac{d}{c}$ to obtain:
$\dfrac{1}{\frac{1}{c^8}}=1 \times \frac{c^8}{1}=c^8$
