Answer:
4x^(-4/3)
Explanation:
Let's rewrite the powers in fraction form :
8/(8x^4)^(1/3)
now simplify the denominator : (8x^4)^(1/3)
(8x^4)^(1/3) = 2x^(4/3)
8/2x^(4/3)
4/x^(4/3)
Now we can make it so there are no denominators by flipping it.
4/x^(4/3) becomes 4x^(-4/3)