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Questions  

 Consider a branch of the hyperbola x22y222x42y6=0 with vertex at the point A . Let B be one of 

 the endpoints of its latus rectum. If C is the focus of the hyperbola nearest to the point A, then the area of triangle ABC is

a
1−2/3
b
3/2−1
c
1+2/3
d
3/2+1

detailed solution

Correct option is B

x2−2y2−22x−42y−6=0 or  x2−22+2−2y2+22y+2=4 or  (x−2)24−(y+2)22=1Now B is one of the end points of its latus rectum and C is the focus of the hyperbola nearest to the vertex A. Clearly, area of LABC does not change if we consider similar hyperbola with center at (0,0) or hyperbola x24−y22=1 Here vertex is A(2,0) . ∴ a2e2=a2+b2=6 So, one of the foci is B(6,0) , point C is ae,b2/a or (6,1) . ∴ AB=6−2 and BC=1∴  Area of ΔABC=12AB×BC=12(6−2)×1                                   =32−1 sq.units.

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