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Question

The circle through (2,5) , (0,0) and intersecting the circle x2+y24x+3y2=0 orthogonally is

A
2x2+2y211x16y=0
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B
x2+y24x4y=0
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C
x2+y2+2x5y=0
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D
x2+y2+2x5y+1=0
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Solution

The correct option is A 2x2+2y211x16y=0
Let x2+y2+29x+2fy=0 is a equation of circle which passes through (2,5) and (0,0) and intersecting circle
x2+y24x+3y1=0 orthogonal.
(g+2)2+(f5)2=g2+f2
g2+f24g+4+10f+25=g2+f2
10f4g+29=0 ---------(1)
and By using property of orthogonality of circles,
2g1g2+2f1f2=c1+c1+c2.
2x(g1)(2)+2f1(+32)=012
4g+3f=1 ---------(2)
from (1) & (2),
7f+28=0
f=4
and g=114
So, eq4 of circle is
x2+y2112x8y=0
2(x2+y2)11x16y=0

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