Questions
If the tangents at the extremities of a focal chord of
the parabola meet the tangent at the vertex
at points whose abcissac are and then
a
a2
b
a2-1
c
a2+1
d
-a2
detailed solution
Correct option is D
One extremity of the focal chord be 2at,at2 . Equationof the tangent is tx=y+at2 which meets thetangent at the vertex y=0 at x=at so x1=at and x2=a−1t thus x1x2=−a2.Talk to our academic expert!
Similar Questions
The length of the perpendiculars from the focus
and the extremities of a focal chord of a parabola
on the tangent at the vertex form
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