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Question

Equation of the ellipse whose focus is (6,7) directrix is x+y+2=0 and e=13 is:

A
5x2+2xy+5y276x88y+506=0
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B
5x22xy+5y276x88y+506=0
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C
5x22xy+5y2+76x+88y506=0
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D
None of the above
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Solution

The correct option is B 5x22xy+5y276x88y+506=0
Focus:(6,7), directrix:x+y+2=0, e=13
equation of ellipse:(x6)2+(y7)2=(13)2(x+y+21+1)2
6(x2+y2+36+4912x14y)=x2+y2+4+2xy+4x+4y
5x2+5y22xy76x88y+506=0

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