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1240

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

Decades: 1190s 1200s 1210s 1220s 1230s - 1240s - 1250s 1260s 1270s 1280s 1290s

Years: 1235 1236 1237 1238 1239 - 1240 - 1241 1242 1243 1244 1245

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Quadratic formula

... formula is not ideal. See Loss of significance for details. Derivation The quadratic formula is derived by the method of completing the square[?]. ...