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Homework Help: Find the equation of an ellipse

  1. Jan 13, 2007 #1
    How can one find the eq. of an ellipse given that the foci are (-2,0) and (2,0) and that the directrices are x=-8 and x=8?
  2. jcsd
  3. Jan 13, 2007 #2


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    What have you done with this problem? You need to show your work.
  4. Jan 15, 2007 #3
    the ratio of distance to its focus to the distance to the corresponding directrix is a constant. even in the case of two foci, as in the ellipse, applying this on a single focus-directrix combination is the whole conic section.
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