Question

Evaluate the function for the given value.
If f(x) = -3x2 – 8, then f(-4)= ?

Answer 1

The answer is

`f( - 4) = - 56`

Explanation:

`f(x) = - 3 {x}^(2) - 8 \\`

To find f(-4) , substitute the value of x that's - 4 into f(x). That is for every x in f(x) , replace it with - 4

We have

`f( - 4) = - 3 ({ - 4})^(2) - 8 \\ = - 3(16) - 8 \\ = - 48 - 8 \: \: \: \: \:`

We have the final answer as

`f( - 4) = - 56`

Hope this helps you