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Math Help - Ellipse questions

  1. #1
    Junior Member
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    Ellipse questions

    I need a hand at these two problems:

    1) How do I find the vertices of the ellipse x[squared]/36 + y[squared]/12=1?

    2) How do I find the foci of the ellipse x[squared]/7 + y[squared]/16=1?
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  2. #2
    Senior Member
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    1.) x^2/36 + y^2/12 = 1
    Since a^2 = 36 because it is bigger
    a= + or - 6

    So vertex... SInce it lies on the x-direction: V(+/- a,0)
    V_1(6,0)
    V_2(-6,0)

    2) How do I find the foci of the ellipse x[squared]/7 + y[squared]/16=1
    c^2 = a^2 - b^2
    c = \squareroot of (16 - 7)
    c =\squareroot of 9
    c= + or - 3
    Foci... Since it lies on the y direction F(0, + or - c)
    F_1 = (0, 3)
    F_2 = (0,-3)
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  3. #3
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    I know this is off topic but it makes me happy seeing you actually learning something at the forum and responding to a thread.
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  4. #4
    Junior Member
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    Sorry if you need to have that kind of feedback.

    I only post a question for a group of questions I am working on. I take what I learn from the one everyone helps me with and do a number of problems that are similar to it so I get familiar through the practice off-line.

    I wish you could only look back at my previous questions and see how far I have actually come.
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