[ab(3-b)-2a(b-1/2b^2)]x(-3a^2b^3)=

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[ab(3-b)-2a(b-1/2b^2)]x(-3a^2b^3)=[ab(3-b)-2a(b-1/2b^2)]x(-3a^2b^3)=[ab(3-b)-2a(b-1/2b^2)]x(-3a^2b^3

[ab(3-b)-2a(b-1/2b^2)]x(-3a^2b^3)=
[ab(3-b)-2a(b-1/2b^2)]x(-3a^2b^3)=

[ab(3-b)-2a(b-1/2b^2)]x(-3a^2b^3)=
[ab(3-b)-2a(b-1/2b^2)]x(-3a^2b^3)
=[3ab-ab^2-2ab+ab^2]*(-3a^2b^3)
=ab*(-3a^2b^3)
=-3a^3b^4