Answers

2014-09-28T16:20:58+08:00
A³b³-ab³ 
dealing with factors.. consider the minimum value of exponent
so you'll have
ab³(a²-1)
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2014-09-29T16:32:41+08:00
(a^3b^3-ab^3)
bring out the greatest common factor (GCF)
there gcf is ab^3
so, the factor is ab^3(a^2-1) since a^2-1 is also factorable, it will become ab^3(a+1)(a-1)

note:(a+1)(a-1) are the factors of a^2-1
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