For this case we have the following function:
[tex] f (x) = 2x
[/tex]
Rewriting the function we have:
[tex] y = 2x
[/tex]
From here, we clear the value of x to find the inverse of the function.
We have then:
[tex] x = \frac{y}{2}
[/tex]
Then, rewriting the variables we have that the inverse function is:
[tex] f (x) ^ - 1 = \frac{x}{2}
[/tex]
Answer:
function f (x) that not equal to f-1 (x) is:
[tex] f (x) = 2x [/tex]
