Express the function in the formfg. (Use only elementary functions, but not the identity function,g(x) =x.)

I am totally lost on what to do.

When it gives mt F(x) and tells me to find g(x) I can do fine... but this.... this is weird.

AND this one confounds me as well

Express the function in the form f g. (Use only elementary functions, but not the identity function, g(x) = x.)