Hi, sorry and thanks in advance to anyone who can help me out.
The question is to simplify it, giving my answer in index form.
Cube root of
(8a^-3)/(64b^-3)
You've simplified the fraction 8/64, and used the exponent rules you've learned to move the $\displaystyle a$ and $\displaystyle b$ variables to get positive exponents. Then you used the fact that cubes and cube-roots are "opposite" processes which, just like addition and subtraction, "undo" each other. And... then what? Where are you stuck?
Please be complete. Thank you!