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The condition that the circles x^(2)+y^(...

The condition that the circles `x^(2)+y^(2)+2ax+c=0, x^(2)+y^(2)+2by+c=0` may touch each other is

A

`1/(a^(2))+1/(b^(2))=1/c`

B

`1/(a^(2))+1/(b^(2))=1/(c^(2))`

C

`1/(a^(2))+1/(b^(2))=2/(c^(2))`

D

`1/a+1/b=2/c`

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The correct Answer is:
A
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AAKASH SERIES-CIRCLES-PRACTICE EXERCISE
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  8. The area (in sq units) of the triangle formed by the tangent, normal a...

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  10. The area of the triangle formed by the tangents from (1,3) to the circ...

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  11. The area of an equilateral triangle inscribed in the circle x^(2)+y^(2...

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  12. A right angled isoceles triangle is inscribed in the circle x^(2)+y^(2...

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  13. Observed the following statements I: The intercepts of the circle x^...

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  14. The polar of p with respect to a circle s=x^(2)+y^(2)+2gx+2fy+c=0 with...

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  15. Given that p(x(1),y(1)) is interior point of the circle S=x^(2)+y^(2)+...

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  16. The line y=mx+c intersects the circle x^(2)+y^(2)=r^(2) in two distin...

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  17. The locus of the point (2+3cos theta, 1+3 sin theta) when theta is par...

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  18. The coordinate of the point on the circle (x-1)^(2)+(y+2)^(2)=9 having...

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  19. The parametric equation of the circle x^(2)+y^(2)+8x-6y=0 are

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