If the line x - 1 = 0 , is a directrix of the hyperbola k x 2 - y 2 = 6 , then the hyperbola passes through…

If the line x-1=0, is a directrix of the hyperbola kx2-y2=6, then the hyperbola passes through the point
  1. -25,6
  2. -5,3
  3. 5,-2
  4. 25,36

Solution

Given equation of hyperbola is x26k-y26=1

Equation of directrix will be x=±ae,

Where e=1+b2a2=1+66k=1+k

i.e. k-1

 x=±6k1+k is the equation of directrix

i.e. ±6k1+k=1

   k1+k2=6k2+k-6=0

 k=2 as k=-3 is rejected

So equation of hyperbola will be Hx23-y26=1

  5,-2 satisfy the given hyperbola

Asked in: JEE Main 2022 (26 Jul Shift 2)

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