Decades: 1340s 1350s 1360s 1370s 1380s - 1390s - 1400s 1410s 1420s 1430s 1440s
Years: 1390 1391 1392 1393 1394 - 1395 - 1396 1397 1398 1399 1400
Births
Deaths
... solutions x, both of which are real. (Geometrically, this means that the parabola intersects the x-axis in two points.) If the discriminant is negative, then there ...