For the hyperbola , which of the following remains constant when varies?
- (A)eccentricity
- (B)directrix
- (C)abscissae of vertices
- (D)abscissae of foci✓ Correct
Answer: (D)
Solution
For this hyperbola and . The relation gives , so . The foci lie at , so the abscissae of the foci stay fixed at however varies.
JEE Main · 2007 · 29 Apr 2007 · Offline · Single correct option