Decades: 1320s 1330s 1340s 1350s 1360s - 1370s - 1380s 1390s 1400s 1410s 1420s
Years: 1371 1372 1373 1374 1375 - 1376 - 1377 1378 1379 1380 1381
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... 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 in which we ca ...