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Homework Help: 1-1 inverse functions

  1. Mar 21, 2010 #1
    1. The problem statement, all variables and given/known data
    f(22)=9 and f^-1(13)=7

    find f^-1(9) and f(7)

    (given that these are 1-1 functions)

    2. Relevant equations
    What does this mean as the have not given the equations they used to find the values, i know inverse function is the function that can find the opposite of the original function.

    3. The attempt at a solution
    Can someone help me see how to start to work out this problem??
  2. jcsd
  3. Mar 21, 2010 #2


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    Homework Helper

    If a function f maps x onto y, then what should the inverse function do?
  4. Mar 21, 2010 #3
    map y onto x, but what does that mean
  5. Mar 21, 2010 #4


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    Homework Helper

    In the first case f(22)=9, this means that the function f, maps 22 to 9.

    then f-1(9), means the function f-1 maps 9 onto ?
  6. Mar 22, 2010 #5
    What does it mean by [tex]f^{-1}[f(x)][/tex] or [tex]f[f^{-1}(x)][/tex] it simply means to tie your shoelace and undo it .. or vice versa.
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