Simplify the numerator.

Rewrite as .

Factor out .

Reorder and .

Add parentheses.

Pull terms out from under the radical.

Reduce the expression by cancelling the common factors.

Reduce the expression by cancelling the common factors.

Factor out of .

Factor out of .

Cancel the common factor.

Rewrite the expression.

Divide by .

Rewrite as .

Factor out .

Reorder and .

Add parentheses.

Pull terms out from under the radical.

To write as a fraction with a common denominator, multiply by .

Combine and .

Combine the numerators over the common denominator.

Move to the left of .

Add and .

Simplify -( cube root of 2z^4)/8+ cube root of (128z^4)/64