Solution: What is the equation of the directrix of an ellipse?

An ellipse with center at the origin has a length of major axis 20 units. If the distance from center of ellipse to its focus is 5, what is the equation of its directrix?

What is the equation of the directrix of an ellipse?

Problem Statement:

An ellipse with center at the origin has a length of major axis 20 units. If the distance from center of ellipse to its focus is 5, what is the equation of its directrix?

Problem Answer:

The equation of the directrix of the ellipse is x = ±20.

Solution:

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