The unknown variable in that function.
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f(x)=x^2 apex
An equation where the left is the function of the right. f(x)=x+3 is function notation. The answer is a function of what x is. f(g(x))= the answer the inside function substituted in the outside function.
f(f(x)) = f(x). Only if f is 1-1 then we have a solution f(x)=x.
X squared is not an inverse function; it is a quadratic function.
implicit function/? an equation the function(x,y)=0 defines y implicitly as a function of x the domain of that implicitiy defines function consists of those x for which there is a unique y such that the function (x,y)=0