Equation of the hyperbola passing through (2,1) and having the distance between the Directrices is 4√3 is
5x2-2y2 =18
3x2-2y2 =10
2x2-y2 =7
3x2-5y2 =7
⇒ Substitute the pt in options and verify
Equation of the hyperbola with centre (0,0) distance between the foci is 18 and distance between directrices 8.
In a hyperbola e = 94 and the distance between the directrices is 3. Then the length of Transverse axis is