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Math Help - Hard Algebra/Trig Problem

  1. #1
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    Hard Algebra/Trig Problem



    Thanks

    EDIT: The left side of the equation should be 18.75/2 instead of just 18.75
    Last edited by mr fantastic; October 23rd 2009 at 03:29 AM. Reason: Restored deleted question.
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  2. #2
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    Quote Originally Posted by stones44 View Post


    Thanks

    EDIT: The left side of the equation should be 18.75/2 instead of just 18.75
    solution has to be in the interval -7.5 \le x \le 7.5

    my calculator says x \approx 5.0547354
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  3. #3
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    Yeah, i found out that was the answer using wolfram alpha..but can anyone show me how?

    http://www.wolframalpha.com/input/?i=-%289.375-%28%2856.25pi%29%2F4%29%29%3D%2828.125arcsin%28%28 1%2F7.5%29x%29%29%2B%283.75x*sqrt%281-%28%281%2F56.25%29x^2%29

    How did the come up with the part in the "Result" section?
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