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Question

The slope of the radical axis of the circles x2+y2+3x+4y5=0 and
x2+y25x+5y6=0 is

A
1
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B
3
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C
5
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D
8
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Solution

The correct option is C 8
eqn of radial axis is given by s1s2=0
s1=x2+y2+3x+4y5=0
s2=x2+y25x+5y6=0
s1s2=0
8xy+1=0
slope=m=81=8

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