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1228

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

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

Years: 1223 1224 1225 1226 1227 - 1228 - 1229 1230 1231 1232 1233

Events

Births

Deaths

Robert of Courtenay, emperor of the Latin Empire

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Quadratic formula

... the method of completing the square[?]. <math>ax^2+bx+c=0</math> Dividing our quadratic equation by a, we have <math> x^2 + \left( \frac{b}{a} ...