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for reversed signs .... same signs equal positive, different signs equal positive...multiply it out yourself so its ingrained in your head

(a - b)(a 2 + ab + b 2) this is the actual equation that I need help with I just realized.

multiply out, learn sign rules and index rules for multiplication and division.

Would it be (a - b)(a^2 + ab + b^2) always and then the opposite is (a + b)(a^2 - ab + b^2) always?