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The condition for the lines lxk+my+n=0 a...

The condition for the lines `lxk+my+n=0` and `l_(1)x+m_(1)y+n_(1)=0` to be conjugate with respect to the circle `x^(2)+y^(2)=r^(2)` is

A

`r^(2)(ll_(1)+mm_(1))="nn"_(1)`

B

`r^(2)(ll_(1)-mm_(1))="nn"_(1)`

C

`r^(2)+(ll_(1)+mm_(1))+"nn"_(1)=0`

D

`r^(2)(lm_(1)+ml_(1))="nn"_(1)`

Text Solution

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The correct Answer is:
A
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AAKASH SERIES-CIRCLES-EXERCISE -I
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  13. The pair of tangents from origin to the circle x^(2)+y^(2)+4x+2y+3=0 i...

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  14. The pair of tangents from origin to x^(2)+y^(2)+4x+2y-3=0 is

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  15. The circles x^(2)+y^(2)-8x+6y+21=0, x^(2)+y^(2)+4x=10y-115=0 are

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  18. The number of common tangents to x^(2)+y^(2)=8, x^(2)+y^(2)=2 is

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  19. The number of common tangents to x^(2)+y^(2)=256, (x-3)^(2)+(y-4)^(2)=...

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  20. The number of common tangentss to the circles x^(2)+y^(2)-8x+2y=0 and ...

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