Answer:
f(x)=-2x²+2x-20
Replacing x with -8 , we get
f(-8)=-2(-8)²+2(-8)-20
=-2×64-16-20
=-128-16-20
=-164
[tex]f(x) = - 2x^{2} + 2x - 20 \\ = > f( - 8) = - 2 {( - 8)}^{2} + 2( - 8) - 20 \\ = - 2(64) - 16 - 20 \\ = - 128 - 16 - 20 \\ = - 164[/tex]
The answer is -164.
