# 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?

#### 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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