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Mathematics 17 Online
OpenStudy (anonymous):

Find the constant difference for a hyperbola with foci at F1 (-29, 0) and F2 (29, 0), and point on the hyperbola (21, 0).

OpenStudy (mertsj):

Find the distance from each focal point to (21,0). Subtract those two distances. That is the constant you are looking for.

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