If f 4 5 which of the following could not be the inverse of f x algebra homework help

If f(-4) = 5, which of the following could not be the inverse of f(x)? 

g(x) = x – 9

g(x) = x2 – 11

g(x) = x2 – 5x – 4 

g(x) = -x2 + 3x + 6

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