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Question 616343: What is the radius of the circle given by the equation below?
x2 - 14x + y2 + 12y = -69
Answer by lwsshak3(11628)   (Show Source):
You can put this solution on YOUR website! What is the radius of the circle given by the equation below?
Standard form of equation for a circle: (x-h)^2+(y-k)^2=r^2, (h,k)=(x,y) coordinates of center, r=radius
x2 - 14x + y2 + 12y = -69
complete the square.
(x^2-14x+49)+(y^2+12y+36) = -69+49+36
(x-7)^2+(y+6)^2=16
r^2=16
radius=√16=4
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