Question

F(x)=2x^(2)-5x-20 find f(-9)

Answer 1

It is -29 u should get this app it helps when you don’t know

Answer 2

187

Explanation:

`f(x) = 2 {x}^(2) - 5x - 20`

To find f(-9) , substitute the value of x that's - 9 into f (x). That is for every x in f(x) replace it with - 9

We have

`f( - 9) = 2 ({ - 9})^(2) - 5( - 9) - 20 \\ = 2(81) + 45 - 20 \\ = 162 + 25 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \\ = 187 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \:`

We have the final answer as

187

Hope this helps you