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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

... discriminant is negative, then there are two different solutions x, both of which are complex numbers. The two solutions are complex conjugates of each other. (In this case, ...