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Use the following equation find the radius of the circle by completing the square. x2 + y2 + 16x − 14y − 211 = 0
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Use the following equation find the radius of the circle by completing the square. x2 + y2 + 16x − 14y − 211 = 0

User Birjolaxew
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Hi,

x^2+y^2+16x-14y-211=0\\ x^2+2*8x+64 +y^2-2*7y+49 -211-64-49=0\\ (x+8)^2+(y-7)^2=18^2\\ radius is 18.
User Rick Weller
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