In the Windows computer operating system, CTRL X is the key stroke for performing a 'cut' (as in cut and paste).
CTRL-C is copy.
CTRL-X is cut.
CTRL-V is paste.
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f(x) = ...f is the name of the function, and x is the variable. I guess you could say x is the root of the function, because it is what the function relies on.
The only function that can be symmetric about the x-axis is the x-axis itself. For each value of x a function, f(x), can have at most one value for f(x). Otherwise it is a mapping or relationship but not a function.
Function "f" depends on "x", and function "g" depends on function "f".
Either - or both - can be true.
A function of x means that the answers depends on the value of x that is substituted into the function. For example: y = x + 1 If x = 1, y = 2 If x = 2, y = 3 and so on.