Decades: 1270s BC 1260s BC 1250s BC 1240s BC 1230s BC - 1220s BC - 1210s BC 1200s BC 1190s BC 1180s BC 1170s BC
Significant People
... left side is now a perfect square; it is the square of (x + b/(2a)). The right side can be written as a single fraction; the common ...