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Determine the domain of the resulting functions

1. f(x) = x+5
g(x) = x-8
2.f(x) = 2 x^{2} minus x,minus 1
g(x) = 4 x^{2} -1
3.f(x) =  \sqrt{x} 4-x
g(x) =  \sqrt{x} x+4
It says resulting functions, but there doesn't seem to be any operation to be performed on the given functions
I need to know what operation of functions will i use in order to know the resulting function


Their domain is  x such that x are all elements of real number (-infinity, +infinity)

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