The equation of the conic with focus at (1, ?1), directrix along \[x-y+1=0\] and with eccentricity \[\sqrt{2}\] is [EAMCET 1994]

The equation of the conic with focus at (1, ?1), directrix along \[x-y

1.	The equation of the conic with focus at (1, ?1), directrix along \[x-y+1=0\] and with eccentricity \[\sqrt{2}\] is [EAMCET 1994]
A.	\[{{x}^{2}}-{{y}^{2}}=1\]
B.	\[xy=1\]
C.	\[2xy-4x+4y+1=0\]
D.	\[2xy+4x-4y-1=0\]
Answer» D. \[2xy+4x-4y-1=0\]

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The equation of the conic with focus at (1, ?1), directrix along \[x-y+1=0\] and with eccentricity \[\sqrt{2}\] is [EAMCET 1994]

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