Length of Intercept Made by a Circle on a Straight Line
The circle th...
Question
The circle through (−2,5) , (0,0) and intersecting the circle x2+y2−4x+3y−2=0 orthogonally is
A
2x2+2y2−11x−16y=0
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B
x2+y2−4x−4y=0
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C
x2+y2+2x−5y=0
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D
x2+y2+2x−5y+1=0
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Solution
The correct option is A2x2+2y2−11x−16y=0 Let x2+y2+29x+2fy=0 is a equation of circle which passes through (−2,5) and (0,0) and intersecting circle x2+y2−4x+3y−1=0 orthogonal. ∴√(−g+2)2+(−f−5)2=√g2+f2 ∴g2+f2−4g+4+10f+25=g2+f2 10f−4g+29=0 ---------(1) and By using property of orthogonality of circles, ∴2g1g2+2f1f2=c1+c1+c2. ∴2x(g1)(−2)+2f1(+32)=0−12 −4g+3f=−1 ---------(2) from (1) & (2), 7f+28=0 f=−4 and g=−114 So, eq4 of circle is ⇒x2+y2−−112x−8y=0 ⇒2(x2+y2)−11x−16y=0