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MathematicsParabolaTangent to ParabolaMedium2 minPYQ_2015
MathematicsMediumnumerical

Suppose that the foci of the ellipsex29+ y25=1aref1, 0 and (f2, 0)wheref1>0 and f2<0.LetP1 and P2be two parabolas with a common vertex at (0, 0) and with foci atf1, 0and2f2, 0,respectively. LetT1be a tangent toP1which passes through2f2, 0andT2be a tangent toP2which passes through(f1, 0). Ifm1is the slope ofT1andm2is the slope ofT2,then the value of1m12+ m22is

Question diagram: Suppose that the foci of the ellipse x 2 9 + y 2 5 = 1 are f
Answer:
4.00
Solution:



f1 (2, 0)
f2 (-2, 0)
Parabolas are
y2= 8x
y2= -16x
T1 :y=mx+2m
0= -4m+2m
  m2=12
T2 :y=mx-4m
2m-4m=0
  m2=2
Now,m22+ 1m12=2+2=4

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

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