Answer:
f(x) = 1 /x
Step-by-step explanation:
We know that

and

Now, what must be the form of f(x)?
Let us guess.
If we said

then what would be f(g(x)) in this case?
To find out we simply replace x with g(x). This gives


which is exactly the form we are told f(g(x)) take! This means our guess was correct and
