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Math Help - help me to find the inverse function

  1. #1
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    help me to find the inverse function

    find the inverse of the function f(x)=x^2 - 3x
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  2. #2
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    Quote Originally Posted by nmaths
    find the inverse of the function f(x)=x^2 - 3x
    The function does not posess an inverse.
    Because it is not one-to-one. For example, f(3)=f(0) and 3\not = 0.
    Perhaps you mean on a restricted domain?
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  3. #3
    Super Member Rebesques's Avatar
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    Well, you can find an inverse for (say) x>0. The way to find inverses is rather limited: equate y=f(x) and solve for x. That is the inverse function x=g(y).

    Here, we have y=f(x)=x^2-3x or x^2-3x-y=0. Solve this (quadratic for x), and you have obtained the inverse function.
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