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1385

Centuries: 13th century - 14th century - 15th century

Decades: 1330s 1340s 1350s 1360s 1370s - 1380s - 1390s 1400s 1410s 1420s 1430s

Years: 1380 1381 1382 1383 1384 - 1385 - 1386 1387 1388 1389 1390

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Quadratic formula

... roots of both sides yields <math>x+\frac{b}{2a}=\frac{\pm\sqrt{b^2-4ac}}{2a}.</math> Subtracting b/(2a) from both sides, w ...

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