Answer
$a^3-b^3$
Work Step by Step
FOIL the terms in the parentheses in order to distribute the multiplication. Then combine like terms to simplify.
$(a-b)(a^2+ab+b^2)$
$a^3+a^2b+ab^2-a^2b-ab^2-b^3$
$a^3-b^3$
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