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# If f(x) = x + 18, what does f^−1(95) equal?

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- Anonymous1 decade agoFavorite Answer
First find the inverse function. If f(x) = x + 18, then

y = x + 18

y - 18 = x

x = y - 18

This means f^-1(x) = x - 18.

So f^-1(95) is f^-1(95) = 95 - 18 = 77.

- ComoLv 71 decade ago
Let f ( x ) = y and g ( y ) = x

ie g is inverse of f

y = x + 18

x = y - 18

g ( y ) = y - 18

g ( x ) = x - 18

f^(-1) ( x ) = x - 18

f^(-1) (95) = 95 - 18

f^(-1) (95) = 77

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