Question

Points A and B are the foci of a conic section. Two points on the conic section, C and D, have distances to the foci A and B as shown.
CA=5
CB=10
DA=8
In order for the points C and D to be on the same hyperbola, the distance DB would have to equal ____?

Answer 1

A. 3
B. 7
D. 15
E. 18
F. none of the above

Answer 2

@Hero @mathstudent55

Answer 3

B

Answer 4

You sure? @Jdiebolt ?