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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

... \frac{b}{a} \right) x + \frac{c}{a}=0 </math> which is equivalent to <math>x^2+\frac{b}{a}x=-\frac{c}{a}.</math> The equation is now in a form ...