Respuesta :

Given data:

The given expression is -1/2 y(2y^3 -8).

The given expression can be written as,

[tex]\begin{gathered} -\frac{1}{2}y(2y^3-8)=-\frac{1}{2}y(2y^3)+\frac{1}{2}y(8) \\ =-y^4+4y \end{gathered}[/tex]

Thus, the correct option is first -y^4 +4y.

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