One of the factors of 3ab + 3a + 2b + 2 is
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3ab + 3a + 2b + 2
=3a(b+3)2(b+1)
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a^3-3a^2b+3ab^2-b^3(a-b) ^3=a^3-b^3-3ab(a-b) a^3-b^3-3a^2b+3ab^2 comparing both polynomials we get a^3-3a^2b+3ab^-b^3=(a-b) ^3.
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