Apply the distributive property.

Multiply by .

Multiply by .

Add and .

Subtract from .

Factor out of .

Factor out of .

Factor out of .

Factor out of .

Rewrite as .

Since both terms are perfect cubes, factor using the difference of cubes formula, where and .

Factor.

Simplify.

Multiply by .

One to any power is one.

Remove unnecessary parentheses.

Factor (3x^4-3x)-(3x-3x^4)