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
... x) to the expression to the left of "=", that will make it a perfect square trinomial of the form x2 + 2xy + y2. Since "2xy" in this case is (b/a)x, we must have y = ...