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Mathematics 18 Online
OpenStudy (anonymous):

Find the constant sum for an ellipse with foci F1 (0, -8) and F2 (0, 8) and the point on the ellipse (0, 10).

OpenStudy (amistre64):

add the distances that the point is from the each focus

OpenStudy (amistre64):

(10--8) + (10-8) = 18 + 2

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