# Finding the equation of an ellipse from foci and directrices

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?

## Answers and Replies

cristo
Staff Emeritus
Science Advisor
This seems like a homework question. What have you tried?

berkeman
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?