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Whats wrong in my solutiol? plz correct me if im wrong. i am gettin this answer but its given to be b

Whats wrong in my solutiol? plz correct me if im wrong. i am gettin this answer but its given to be b

Question Image
Grade:12

2 Answers

Deepak Kumar Shringi
askIITians Faculty 4405 Points
3 years ago
562-38_Capture.PNG
Kamal Desai
24 Points
3 years ago
In circle co eff of x²=co eff of y²Let lamda=l and mu=ul=u......eq 1Now co eff of xy=0l+u=4From eq 12l=4l=u=2Now circle`s equation2x²+2y²-2x-2y-20=0x²+y²-x-y-10Now centre of circle c(1/2,1/2)radius of circle r²=g²+f²-c =1/4+1/4+10 =1/2+20/2 r=√21/√2r=√42/√4 multiply and divide by√2r=√42/2Answer is B

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