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Questions  

Distance of a point P on the parabola y2=48x from
the focus is l and its distance from the tangent at
the vertex is d, then l  d is equal to

a
4
b
8
c
12
d
16

detailed solution

Correct option is C

Any point on the parabola is P12t2,24t whosedistance from the focus (12, 0) is 12(t2+1=t andfrom y-axis, the tangent at the vertex is 12t2=d.So l – d = 12.

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