Final answer:
The domain of (gf)(x) is all real numbers.
Step-by-step explanation:
The domain of (gf)(x) is all real numbers.
To find the domain of the composition (gf)(x), we need to consider the domains of both g(x) and f(x). Since the domain of g(x) is all real numbers, and the domain of f(x) is also all real numbers, the composite function (gf)(x) will have the same domain, which is all real numbers.