Rewrite as .

Rewrite as .

Pull terms out from under the radical, assuming positive real numbers.

Multiply by .

Multiply and .

Raise to the power of .

Use the power rule to combine exponents.

Add and .

Rewrite as .

Rewrite as .

Apply the power rule and multiply exponents, .

Combine and .

Cancel the common factor of .

Cancel the common factor.

Divide by .

Simplify.

Rewrite as .

Simplify fourth root of 81/y