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Mathematics 11 Online
OpenStudy (anonymous):

Find the constant sum for an ellipse with foci F1 (3, 0), F2 (24, 0) and the point on the ellipse (9, 8). The constant sum is: _____. Enter only a number.

jimthompson5910 (jim_thompson5910):

Call the point (9,8) the point P

jimthompson5910 (jim_thompson5910):

The constant sum c is equal to the distance from F1 to P + the distance from F2 to P ie c = PF1 + PF2

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