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Math Help - y = f(x) = x^3 - 8

  1. #1
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    y = f(x) = x^3 - 8

    y = f(x) = x^3 - 8

    Write an equation which represents y = f-1(x).

    The -1 in f-1 is in supercript form, which I think stands for inverse.

    This one is harder as it is a cubic expression. How to solve this?

    Thanks.
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  2. #2
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    Quote Originally Posted by shenton View Post
    y = f(x) = x^3 - 8

    Write an equation which represents y = f-1(x)....
    Hello,

    from f(x)=x^3-8 you get

    f^{-1}: x=y^3-8 \Longrightarrow f^{-1}: x+8=y^3 \Longrightarrow f^{-1}: \sqrt[3]{x+8}=y

    EB
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