Mathematics - Parabola Question with Solution | TestHub

MathematicsParabolaTangent to ParabolaEasy2 minPYQ_2015
MathematicsEasysingle choice

If the tangent to the conic,y-6=x2at(2,10)touches the circle,x2+y2+8x-2y=k(for some fixedk) at a pointα, β;then(α, β)is

Options:

Answer:
B
Solution:

The equation of tangent (T=0) would be12 y+10- 6=2x

4x-y+2=0



The center of the circle is(-4,1)and the point of contact would be the foot of perpendicular from(-4,1)on4x-y+2=0

α+44=β-1-1= --16-1+242+12

α+44=1517andβ-1-1=1517

α= -817,β= -1517+1=217

Hence option-817, 217is correct.

Stream:JEESubject:MathematicsTopic:ParabolaSubtopic:Tangent to Parabola
2mℹ️ Source: PYQ_2015

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