Can anyone please help me with this.
Is (fg)(x) the same as (f(g(x))?
No, the first is the product of f and g while the second is the composition of f and g.
The notation that is frequently used for h which is the composition of f and g is:
[tex]h = f\circ g[/tex]
Furthermore, the title of this thread indicates some misunderstanding, and has nothing to do with function products and pertains to function composition only when f is some kind of exponential function.
"f to the g" would be written as follows:
Separate names with a comma.