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
... (b/a)x, we must have y = b/(2a), so we add the square of b/(2a) to both sides, ...