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zmey [24]
3 years ago
13

Can someone help me thanks

Mathematics
2 answers:
Helga [31]3 years ago
7 0

Answer:

-142

Step-by-step 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 :)

Alenkasestr [34]3 years ago
5 0
F(x)=-x^2-9x+20
f(9)=-(9)^2-9(9)+20
f(9)=-81-81+20
f(9)=-142
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