## Encyclopedia > 1226

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# 1226

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

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

Events

Births

Deaths

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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 [itex] x=\frac{-b \pm \sqrt ...