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A³b³-ab³

dealing with factors.. consider the minimum value of exponent

so you'll have

ab³(a²-1)

dealing with factors.. consider the minimum value of exponent

so you'll have

ab³(a²-1)

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

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