Answer
$\frac{-32a^{40}}{b^{15}}$
Work Step by Step
Distribute the exponent to the numerator and denominator and then simplify each term to find a simplified expression.
$(\frac{-2a^8}{b^3})^5$=$\frac{(-2)^5a^{8(5)}}{b^{3(5)}}$=$\frac{-32a^{40}}{b^{15}}$