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Radical axis of any two circles of the f...

Radical axis of any two circles of the family of circle `x^(2)+y^(2)+2lambdax+4=0,lambda in R` is always parallel to

A

`y=x`

B

`y=-x`

C

`x=K` (K is constant)

D

`y=K` (K is constant)

Text Solution

Verified by Experts

The correct Answer is:
C
`b^(2)=acimplies-b^(2)+ac=0`
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