f(x) is not a function. f(x) is a result. f is a function.
For one x, there is only a f(x) to be with.
Domain is very important. If there is not defined in the domain, the function is also not defined.
f(x) is not a function. f(x) is a result. f is a function.
For one x, there is only a f(x) to be with.
Domain is very important. If there is not defined in the domain, the function is also not defined.
