B BrownTown Diamond Member Dec 1, 2005 5,314 1 0 Sep 26, 2006 #2 x^2 + y^2 + 6y = 0 add 9 to both sides: x^2 + y^2 + 6y + 9 = 9 factor: x^2 + (y+3)^2 = 9 profit: