"The equation of the conic with focus at (1,-1) directrix along `x-y+1=0` and eccentricity `sqrt(2)
Channel: Doubtnut
Date: 2020-07-05

"The equation of the conic with focus at (1,-1) directrix along `x-y+1=0`
 and eccentricity `sqrt(2)`
 is
 a.`x y=1`
 b. `2x y+4x-4y-1=0`
 
 c. `x^2-y^2=1`
 d. `2x y-4x+4y+1=0`".