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OpenStudy (anonymous):
find the centre and radius of the circle given by the equation x^(2)+y^(2)-4x+6y-12=0.
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OpenStudy (anonymous):
centre => (4/2,-6/2)=(2,-3) radius= sqrt(2^2+(-3)^2-(-12))=sqrt(4+9+12)=sqrt(25)=5
OpenStudy (anonymous):
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