Question

If f(x) = 4x – 20, what is f(4)?

A. –12
B. –4
C. 16
D. 4

Answer 1

It's B. You enter 4 instead of x on the right side and see what you get.

Answer 2

Answer: B. -4

Explanation:

We are given the function :
`f(x)=4x-20`

To find the value of f(4), we substitute the x equals to 4 in the above function and then simplify it to get the answer.

i.e. At x= 4 ,
`f(4)=4(4)-20`

Now, simplify the above expression, we get

`f(4)=16-20=-4`

Therefore, the correct option is Option (B.) -4 .