Answer :
[tex]Y=x^4-2x^3-8x^2+12x-16[/tex]
We will simplify further:
[tex]\begin{gathered} Y=x^4-2x^3-8x^2+12x-16 \\ when\colon x=0 \\ Y=0^4-2(0)^3-8(0^2+12(0)-16 \\ Y=-16 \\ \end{gathered}[/tex]