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Exer. $41-44:$ Find an equation for the set of points in an Xy-plane such that the sum of the distances from $F$ and $F$ is $k$$$F(0,8), \quad F(0,-8) ; \quad k=20$$
Step 1
This means that the distance between the two foci, or 2c, is 16 units. Therefore, the value of c is 8 units. Show more…
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