Question

Can someone help me thanks

Answer 1

f(x)=-x^2-9x+20
f(9)=-(9)^2-9(9)+20
f(9)=-81-81+20
f(9)=-142

Answer 2

-142

Explanation:

So we have the function:

`f(x)=-x^2-9x+20`

To find f(9), substitute x for 9:

`f(9)=-(9)^2-9(9)+20`

Square the first term and multiply the second:

`f(9)=-81-81+20`

Add:

`f(9)=-142`

And that's our answer :)