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Math Help - inverse function help !

  1. #1
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    inverse function help !

    hi , im stuck on this question i can do most of it but not the last bit:

    heres the question:

    f(x) = (x+10) / (x-8) (where x isnt 8)

    1) find a positive integer p such that f(p) = p

    2)find also f^-1(p) for the positive integer found in question 1


    thanks
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  2. #2
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    Quote Originally Posted by mike--1988 View Post
    hi , im stuck on this question i can do most of it but not the last bit:

    heres the question:

    f(x) = (x+10) / (x-8) (where x isnt 8)

    1) find a positive integer p such that f(p) = p

    2)find also f^-1(p) for the positive integer found in question 1


    thanks
    1) Solve \frac{p+10}{p-8} = p.

    2) You should know that if f(p) = p then f^{-1} (p) = p since points on the line y = x get reflected onto themselves.
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