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1270

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

Decades: 1220s 1230s 1240s 1250s 1260s - 1270s - 1280s 1290s 1300s 1310s 1320s

Years: 1265 1266 1267 1268 1269 - 1270 - 1271 1272 1273 1274 1275

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Quadratic formula

... we get <math>x=\frac{-b}{2a}\pm\frac{\sqrt{b^2-4ac}}{2a}=\frac{-b\pm\sqrt{b^2-4ac}}{2a}.</math> Generalizations The formula and its proof remain ...