Let f=sqr(7-x), then

g(x)=f(x)+2

is one of the possibilities.

It all depends on what f is. g is already in function notation.

You haven't defined f(x).

what's f(x) ?

No way we can answer that until you tell us what f(x) is.

.

g(x) = √(7 - x) + 2

you are missing something in your question.

Let’s say

if g(x) = 2 + √x and f(x) = 7 - x

then g○f = g( f(x) ) = 2 + √(7 - x)

But you need to double check your question

You would first need to have a definition for function f. It appears you do not.