Finding ellipse equation from foci and directrices

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kasse
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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?
 

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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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