Find the radius of the circle with equation 9x2−18x+9y2+36y+44=0
Split up the 44 to + 9 and + 36 - 1
Factor out the 9:
9(x^2 - 2x + 1) + 9(y^2 + 4y + 4) - 1 = 0
(x-1)^2 + (y+2)^2 = 1/9 = r^2
r = 1/3
