Decades: 0s BC - 0s - 10s - 20s - 30s - 40s - 50s - 60s - 70s - 80s - 90s - 100s
81 82 83 84 85 86 87 88 89 90 91
Events:
Births:
Deaths:
... case is (b/a)x, we must have y = b/(2a), so we add the square of b/(2a) to both sides, ...