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1226

Centuries: 12th century - 13th century - 14th century

Decades: 1170s 1180s 1190s 1200s 1210s - 1220s - 1230s 1240s 1250s 1260s 1270s

Years: 1221 1222 1223 1224 1225 - 1226 - 1227 1228 1229 1230 1231

Events

Carmelite Order approved by Pope Honorius III
Frederick II calls Imperial Diet of Cremona

Births

Deaths

Saint Francis of Assisi

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Quadratic formula

... see below for generalizations) with a being non-zero. These solutions are also called the roots of the equation. The formula reads <math> x=\frac{-b \pm \sqrt ...