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Homework Help: Discriminants for ellipse, parabola or hyperbola

  1. Dec 3, 2008 #1
    1. The problem statement, all variables and given/known data

    Use the discriminant to determine if the following are equations of an ellipse, parabola or hyperbola


    2. Relevant equations

    3. The attempt at a solution

    I got these answers:

    [tex]0, parabola[/tex]
    [tex]25, hyperbola[/tex]
    [tex]44, hyperbola[/tex]
    [tex]-119, ellipse[/tex]
    [tex]0, parabola[/tex]

    could someone check me on these? Thanks!
  2. jcsd
  3. Dec 3, 2008 #2


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    Science Advisor
    Homework Helper

    Re: Discriminants

    Shouldn't the third one be 81-4*1*5=61,hyperbola? Was that so hard you really needed a check?
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