Question

If f(x) = 4x – 20, what is f(4)? A. –12 B. –4 C. 16 D. 4

Answer 1

Answer:  B. -4

Step-by-step 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 .

Answer 2

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