It means that the value of the function at any point "x" is the same as the value of the function at the negative of "x". The graph of the function is thus symmetrical around the y-axis. Examples of such functions are the absolute value, the cosine function, and the function defined by y = x2.
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It means the value of the function equals zero when the argument is 4. For example: f(x)=x-4 f(4)=4-4=0
True
yes, it is.
no
Only if it's a function.