Answer
$-2y^4-12y^3+8y$
Work Step by Step
$-2y(y^3+6y^2-4)\rightarrow$ use the distributive property
=$(-2y)(y^3)+(-2y)(6y^2)-(-2y)(4)\rightarrow$ use the product property of exponents
=$-2y^4-12y^3+8y$
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