Question

find the centre and radius of the circle x2+y2-4x+6y=5

Answer 1

we know general equation of circle
${x}^{2} + {y}^{2} + 2gx + 2fy + c = 0$
here
$centre = ( - g..- f)$

here g =-2,,f=3
centre=(2,-3)
radius=√4+9+5=√18=3√2