Factor out .

Pull terms out from under the radical.

Rewrite as .

Rewrite as .

Factor out .

Rewrite as .

Pull terms out from under the radical.

Subtract from .

Add and .

Combine square root of y^3+ square root of 9y^3-3y square root of y

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# Combine square root of y^3+ square root of 9y^3-3y square root of y

Factor out .

Pull terms out from under the radical.

Rewrite as .

Rewrite as .

Factor out .

Rewrite as .

Pull terms out from under the radical.

Subtract from .

Add and .

Combine square root of y^3+ square root of 9y^3-3y square root of y