f(x)=|x| ,g(x)=|x| - 4

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If you are asking what f(-x) and g(-x) are, then the answer is the exact same equation.  By definition, |x| = |-x|For example:|3| and |-3| both equal 3|8| and |-8| both equal 8So, in truth, f(x) = f(-x) and g(x) = g(-x)