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Question

The radical axis of the circles x2+y26x4y+4=0 and x2+y214x5y24=0 is

A
8x+y30=0
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B
8x+y+20=0
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C
8x+3y20=0
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D
8x+y+28=0
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Solution

The correct option is D 8x+y+28=0
The equation of the radical axis is given by
C1C2=0
Or
(x2+y26x4y+4)(x2+y214x5y24)=0
x(146)+y(54)+24+4=0
8x+y+28=0

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