Answer
$-12x^6y^3+28x^3y^4-24x^2y$
Work Step by Step
$-4x^2y(3x^4y^2-7xy^3+6)=\\=-4x^2y\cdot3x^4y^2-4x^2y\cdot(-7xy^3)-4x^2y\cdot6\\=-12x^6y^3+28x^3y^4-24x^2y$
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