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Math Help - find the inverse of a function

  1. #1
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    find the inverse of a function

    it's given that f(x) = v^5 + v^3 + v. So I need to find inverse of (3) and f(f inverse of 2).
    I figured out the first, which is relatively easy.
    v^5 + v^3 + v = 3, where i get v = 1. So inverse of (3) is 1.

    But how do I go about the second part? I know that first I should find the inverse of (2) and then find f(x).
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  2. #2
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    Re: find the inverse of a function

    Quote Originally Posted by Taurus3 View Post
    it's given that f(x) = v^5 + v^3 + v. So I need to find inverse of (3) and f(f inverse of 2).
    I figured out the first, which is relatively easy.
    v^5 + v^3 + v = 3, where i get v = 1. So inverse of (3) is 1.

    But how do I go about the second part? I know that first I should find the inverse of (2) and then find f(x).
    You're expecetd to know that f(f^{-1}(x)) = x by definition.
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  3. #3
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    Re: find the inverse of a function

    huh? But isn't that just the definition?
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  4. #4
    MHF Contributor Siron's Avatar
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    Re: find the inverse of a function

    Yes and that's exactly what you need, f(f^{-1}(2))=...?
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