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Math Help - How do I find the function of x

  1. #1
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    How do I find the function of x

    Hi, please click on the attachment and help me with finding the function of x.

    Thanks.
    Attached Thumbnails Attached Thumbnails How do I find the function of x-question1.gif  
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  2. #2
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    Notice that sqrt(x) squared is x. So if you write t = sqrt(x), your equation is t^2 - 7t - 8, which is a quadratic equation in t. Solve it to get t = -1 or 8 and then find x = 1 or 64.
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  3. #3
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    Thanks for the help. This seems to be a better approach than my book.
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