Question

If f(12)=4(12)-20, what function gives f(x)

Answer 1

well, since f(12) indicates you to put 12 wherever there's a x.Just do the opposite wherever theres a 12 put a x.
Therefore f(x)=4x-20

Answer 2

`f(x)=4x-20`

Explanation:

We have been given that

`f(12)=4(12)-20`

In order to find the function f(x), we can use the concept of substitution.

Let us suppose we need to find the value of the function f(x) at x = 12. Then, we can substitute x = 12 in the function f(x).

Here,
`f(12)=4(12)-20`

It means that x is replaced with 12.

So f(x) should be

`f(x)=4x-20`