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Math Help - How do I find the inverse?

  1. #1
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    How do I find the inverse?

    Problem is find the inverse of f(x) = x^2-2x+4
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  2. #2
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    Quote Originally Posted by Henryt999 View Post
    Problem is find the inverse of f(x) = x^2-2x+4
    The short answer is: you can't.
    There must be some restrictions. What are they?
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  3. #3
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    ops

    Quote Originally Posted by Plato View Post
    The short answer is: you can't.
    There must be some restrictions. What are they?
    Ops, sorry it said: f:[1,\infty)\rightarrow R, f(x) = x^2 -2x +4
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  4. #4
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    Set x = y^2 - 2y + 4

    and solve for y.
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  5. #5
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    Thats it?

    Quote Originally Posted by icemanfan View Post
    Set x = y^2 - 2y + 4

    and solve for y.
    Yes, thanks, that I understand I get
     x-4 = y(y-2)
    And now what?
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  6. #6
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    Quote Originally Posted by Henryt999 View Post
    Yes, thanks, that I understand I get
     x-4 = y(y-2)
    And now what?
    Try this:

    x = y^2 - 2y + 4

    x = y^2 - 2y + 1 + 3

    x = (y - 1)^2 + 3

    etc.
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