Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    Homework Helper
    Gold Member

    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.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook