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Math Help - how to isolate y?

  1. #1
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    how to isolate y?

    I feel like a total idiot asking this question but how do you isolate y? I though this was easy but apparently my brain has left the building...

    y^2-3y-3=0

    how do you get to this???

    y=\frac{\pm 3 \sqrt{21}}{2}
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  2. #2
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    e^(i*pi)'s Avatar
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    Quadratic formula

    edit: or completing the square
    Last edited by e^(i*pi); June 4th 2011 at 01:26 PM. Reason: see post
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  3. #3
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    lol... I am doing this in the context of some substitutions for x and y and have apparently confused myself to the point of forgetting how to solve a quadratic equation... nice.
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