-6(x-y)³+18(y-x)²-24(Y-x)³

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-6(x-y)³+18(y-x)²-24(Y-x)³-6(x-y)³+18(y-x)²-24(Y-x)³-6(x-y)³+18(y

-6(x-y)³+18(y-x)²-24(Y-x)³
-6(x-y)³+18(y-x)²-24(Y-x)³

-6(x-y)³+18(y-x)²-24(Y-x)³
-6(x-y)³+18(y-x)²-24(Y-x)³
=(-6+24)(x-y)^3+18(x-y)^2
=20(x-y)^3+18(x-y)^2
=(x-y)^2(20x-20y+18)