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Homework Help: Suppose f(1) = 2, f '(1) = 3 and f '(2) =4, then f^-1(2)=?

  1. Dec 22, 2011 #1
    1. The problem statement, all variables and given/known data

    Suppose f(1) = 2, f '(1) = 3 and f '(2) =4, then f^-1(2)=?

    2. Relevant equations

    I dont even know what eqn to use
    3. The attempt at a solution
    Knowing that I dont know what eqn to use, how do i solve this
    just plseas give me direct steps on how to answer it..
  2. jcsd
  3. Dec 22, 2011 #2

    D H

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    Staff Emeritus
    Science Advisor

    You don't need the derivatives to solve this problem. Presumably those are for another part of the problem.

    Hint: What is [itex]f^{-1}(f(x))[/itex]?
  4. Dec 22, 2011 #3


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    Science Advisor

    You need to learn the definition of [itex]f^{-1}(x)[/itex].
  5. Dec 22, 2011 #4


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    Homework Helper
    Gold Member

    Is this all the problem?

    There appears to be redundant, or rather irrelevant, information there.
  6. Dec 22, 2011 #5
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