Question

What is the g(x) if 2x-7, if f(x)=2×

Answer 1

I see you're working with composite functions. Unfortunately, you have not shared info regarding how g(x) is to form a composite function with f(x).

If you meant g(f(x)), then g(f(x)) = 2(2^2) - 7. Here f(x) becomes the input to g(x).