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Math Help - Quadratic Formula Question #2

  1. #1
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    Post Quadratic Formula Question #2

    http://i.imgur.com/XviXYODh.jpg

    The question is #10,

    I am really bad at word problems and having to create an equation on my own...

    x^2 - 1/2x = 11

    That is all I got and I am pretty sure I am wrong, I didn't go further with that equation I made...

    The answer to this question is -3.80 and 5.80.

    Any help would be great, thanks!
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  2. #2
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    Re: Quadratic Formula Question #2

    The question is "subtract a number from half its square", you have subtracted half a number from its square.
    Thanks from topsquark
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  3. #3
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    Re: Quadratic Formula Question #2

    I'm dumb, I don't know.
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  4. #4
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    Re: Quadratic Formula Question #2

    Let the number be = x
    subtract the the number from half its square
    It should be : 1/2 x^2 - x
    Now proceed to solve.
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  5. #5
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    Re: Quadratic Formula Question #2

    1/2x^2 - x - 0 = 0

    I got x = 0 and x = 2
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  6. #6
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    Re: Quadratic Formula Question #2

    No you have missed out the RHS. The equation is
    1/2 x^2 - x = 11
    x^2 - 2x - 22=0
    This will give you the desired result.
    Use quadratic formula OK
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