Q.

If a tangent of slope 2 of the ellipse x2a2+y2b2=1  is normal to the circle x2+y2+4x+1=0, then the maximum value of ab is 

 

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a

2

b

none of these 
 

c

1

d

4

answer is A.

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Detailed Solution

Slope of Tangent=2

 equation  of Tangent is y=2x±4a2+b2       

centre =(-2, 0)

eq  is normal to the circle then 

0=-4±4a2+b2 4a2+b2=16 A.MG.M 4a2+b224a2.b2 4a2+b222ab ab  164      ab4

 

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