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Actually the value of f(x) is to be put into the function g(x). If some value is not valid for f(x), it will not be considered.Ummm but it is in the domain of g (x) why not consider that?
The thing to note here is that the values of f(x) are the domain for g(x). Meaning that for finding gf(x), first the value of x will be put into f(x), then the resulting value of f(x) will be put into g(x) to calculate a value for gf(x). Got it?