I have this problem to simplify with positive exponents:
\[\left[(-4a^{-4}b^{-5})^{-3}\right]^4\]
So, working with the interior brackets, I applied -3 to the equation, which resulted in:
\[-(-64)x^{12}b^{15}\]
**because "-4" was not in brackets, the exponent was applied to the 4 only...