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Question

Find center and radius of the circle
2x2+2y24x6y+1=0

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Solution

Given,

2x2+2y24x6y+1=0

x2+y22x3y+12=0

2gx=2xg=1

2fy=3yf=32

r=g2+f2c=(1)2+(32)2+(12)2=72

2x2+2y24x6y+1=0 is a circle with center (1,32) and radius 72

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