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Factor polynomial $$ -56x^{2}y^{4}+16x^{3}y^{4}-32x^{4}y $$
Answer
$$ -56x^{2}y^{4}+16x^{3}y^{4}-32x^{4}y = -8x^{2}y(7y^{3}-2xy^{3}+4x^{2}) $$
Explanation
Factor out common factor $ \color{blue}{ -8x^2y } $:
$$ -56x^2y^4+16x^3y^4-32x^4y = -8x^2y ( 7y^3-2xy^3+4x^2 ) $$