Decades: 1290s BC 1280s BC 1270s BC 1260s BC 1250s BC - 1240s BC - 1230s BC 1220s BC 1210s BC 1200s BC 1190s BC
Significant People
... the discriminant is zero, then there is a repeated solution x, and this solution is real. (Geometrically, this means that the parabola described by the quadratic equation ...