An ellipse is represented by the equation .

each directrix of this ellipse is a from the center on the major axis.

31.25 units from the center on the major axis

Step-by-step explanation:

From the equation of the ellipse we can see that

If a=25, b=15, then

Then

The directrices have equations

and are 31.25 units from the center on the major axis.

it is contrapositive

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