jitender lakhanpal
Last Activity: 11 Years ago
hi amit
the correct option is B
from the above equation we get
d(xy) = 0
xy = const.
it passes through (2,8)
so const = 16 so finally we get
xy = 16 this is a rectangular hyperbola
after algebraic manipulation we can write it as
{(x+y)/4root 2} - {(x-y)/4root 2} = 1
now here comparing this with the equation of hyperbola
length of letus rectum is 8 root 2
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