Question

F(x) = -4x2 – 7x + 4
Find f(-7)

Answer 1

f(-7) = 249

Explanation:

`f(x) = - 4 {x}^(2) - 7x + 4`

To find f(-7) , substitute the value of x that's - 7 into f(x). That is for every x in f(x) replace it with - 7

We have

`f( - 7) = - 4 ({ - 7})^(2) - 7( -7 ) + 4 \\ = 4(49) + 49 + 4 \\ = 196 + 53 \: \: \: \: \: \: \: \: \: \: \:`

We have the final answer as

f( -7) = 249

Hope this helps you