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Math Help - Loading this into the quadratic formula

  1. #1
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    Loading this into the quadratic formula

    Attached document showing my issue, this one's a small one. Basically I'm having trouble seeing how to load this into the quadratic formula.

    This is getting really embarassing. I'm reviewing what I did previous section, watching the video lecture provided, then reading my book, and then trying to do the problems. Even after all that I end up having to ask for help on about every section because of some detail they left out.
    Attached Thumbnails Attached Thumbnails Loading this into the quadratic formula-flash0011.jpg  
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  2. #2
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    Quote Originally Posted by Wolvenmoon View Post
    Attached document showing my issue, this one's a small one. Basically I'm having trouble seeing how to load this into the quadratic formula.

    This is getting really embarassing. I'm reviewing what I did previous section, watching the video lecture provided, then reading my book, and then trying to do the problems. Even after all that I end up having to ask for help on about every section because of some detail they left out.
    2sin^2(\frac{x}{2})-1=0

    au^2+bu+c=0

    Think of the term: 2sin^2(\frac{x}{2}) as the au^2 where a=2 and sin^2(\frac{x}{2}) is the u^2


    So b=0 and c=-1

    Edit (I used u intead of x since x is in the trig function already)
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  3. #3
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    To put this in the quadratic formula, you could write:

    sin(\frac{x}{2})=\frac{-0\pm\sqrt{0^2-4(-1)(2)}}{2(2)}
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