Answer
$(A-B)(A^2+AB+B^2)$
Work Step by Step
RECALL:
A difference of two cubes can be factored using the formula:
$a^3-b^3 = (a-b)(a^2+ab+b^2)$
Thus, with $a=A$ and $b=B$, the missing expression in the given statement is:
$(A-B)(A^2+AB+B^2)$