Decades: 1260s BC 1250s BC 1240s BC 1230s BC 1220s BC - 1210s BC - 1200s BC 1190s BC 1180s BC 1170s BC 1160s BC
Significant People
... x to the quadratic equation <math>ax^2+bx+c=0</math> in terms of the coefficients a, b and c, which are assumed to be real (but see below fo ...