Decades: 340s 350s 360s 370s 380s - 390s - 400s 410s 420s 430s 440s
Years: 394 395 396 397 398 - 399 - 400 401 402 403 404
Births
Deaths
... square 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 ...