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Finding the equation of an ellipse from foci and directrices

  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

    cristo

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    Staff Emeritus
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    This seems like a homework question. What have you tried?
     
  4. Jan 13, 2007 #3

    berkeman

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    Staff: Mentor

    Moved to precalc homework.

    Kasse, you need to show your own work in order to get our help. What are the equations that define an ellipse?
     
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