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General Test
Quantitative Reasoning
Algebra
What is the value of (a - b)3 - a3 + b3 ?
3ab (a - b)
-3ab (a + b)
3ab (a +b)
-3ab (a - b)
(a - b)3 - a3 + b3
= a3 - b3 - 3ab(a-b) - a3 + b3
= -3ab (a - b)