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Isolating for Y

  1. Dec 11, 2008 #1
    1. The problem statement, all variables and given/known data
    I realize this is probably a very simple question but I just can't seem to figure it out. I need to isolate the following equation for y.

    y^2 + 2y = -2x +2

    3. The attempt at a solution
    In my solutions it says that the answer after you isolate for y you should get

    y = -1 + [tex]\sqrt{3-2x}[/tex]

    Im not sure how they got that though.
  2. jcsd
  3. Dec 11, 2008 #2


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    Homework Helper
    Gold Member

    I assume you mean that the answer is [tex]y=-1 \pm \sqrt{3-2x}[/tex]?

    Your equation is quadratic in [itex]y[/itex], so I would use the quadratic equation.:wink:
  4. Dec 11, 2008 #3
    Oh I totally missed that. I tried it out and it works. Thanks a lot!
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