Circles x^2 + y^2 + 4x + d = 0, x^2 + y^2 + 4fy + d = 0 touch each other, if

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10-1.Circle and System of Circles

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Circles $x^2 + y^2 + 4x + d = 0, x^2 + y^2 + 4fy + d = 0$ touch each other, if

A

$f\,\, = \,\, \pm \,\,2\,\sqrt {4\,\, + \;\,d} $

B

$f\,\, = \,\, \pm \,\,\frac{2}{{\sqrt {4\,\, - \,\,d} }}$

C

$f\,\, = \,\, \pm \,\,\sqrt {\frac{d}{{\left( {4\,\, + \;\,d} \right)}}} $

D

$f\,\, = \,\, \pm \,\,\sqrt {\frac{d}{{\left( {4\,\, - \,\,d} \right)}}} $

Solution

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Standard 11

Mathematics

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