Given A-B = 5, ab = 4, then a ^ 3b-2a ^ 2B ^ 2 = AB ^ 3 equals

The = after a ^ 3b-2a ^ 2B ^ 2 = AB ^ 3 should be a + sign
a^3b-2a^2b^2+ab^3=ab(a^2-2ab+b^2)=ab(a^2-2ab+b^2)=ab(a-b)^2= 4*5^2=100

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