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Q.

If foci of an ellipse be (-1, 2) and (-2, 3) and its tangent at a point A is 2x+3y+9=0

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a

Co-ordinate of the point ‘A’ will be 329,1727  

b

Distance between the foci is 22

c

Product of the perpendiculars from foci to any tangent is 56

d

Length of the minor axis of the ellipse will be 214

answer is A, B.

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Detailed Solution

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P(1,2) and Q(2,3)
Hence image of point P from lie 2x + 3y + 9 = 0
x+12=y23=22+6+913X=5;  y=4P=(5,4)
Now length of PQ =9+49=58=2aa=582
We know that,  2ae = PQ
2ae=2ae=12a2e2=12
b2=a2(1e2)
b2=58412b2=5824b2=564b=14
b2=14 length of minor axis =214=56
Equation of line PQ is
(y3)=433(x+2)
3y  9 = 72 + 14
7x  3y + 23 = 0
On solving  we get 7x  3y + 23 = 0 and 2x + 3y + 9 = 0 
we get 329,1727
 

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