(1)-a^3+2a^2-a(2)4xy^2-4x^2y-y^3

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(1)-a^3+2a^2-a(2)4xy^2-4x^2y-y^3(1)-a^3+2a^2-a(2)4xy^2-4x^2y-y^3(1)-a^3+2a^2-a(2)4xy^2-4x^2y-y^3-a^3

(1)-a^3+2a^2-a(2)4xy^2-4x^2y-y^3
(1)-a^3+2a^2-a(2)4xy^2-4x^2y-y^3

(1)-a^3+2a^2-a(2)4xy^2-4x^2y-y^3
-a^3+2a^2-a
=-a(a^2-2a+1)
=-a(a-1)^2
4xy^2-4x^2y-y^3
=y(4xy-4x^2-y^2)
=-y(4x^2-4xy+y^2)
=-y(2x-y)^2

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