One of Dominic's particular concerns was combatting the Albigensian movement in the south of France and north of Spain.
Pope Gregory IX canonized Dominic July 13, 1234.
... b/(2a) from both sides, we get <math>x=\frac{-b}{2a}\pm\frac{\sqrt{b^2-4ac}}{2a}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}.</math> ...