Decades: 60s BC 50s BC 40s BC 30s BC 20s BC - 10s BC - 0s 10s 20s 30s 40s
Years: 22 BC 21 BC 20 BC 19 BC 18 BC 17 BC 16 BC 15 BC 14 BC 13 BC 12 BC
Births
Deaths
... between three qualitatively different cases: If the discriminant is zero, then there is a repeated solution x, and this solution is real. (Geometrically, this means ...