Decades: 20s 30s 40s 50s 60s - 70s - 80s 90s 100s 110s 120s
Years: 68 69 70 71 72 - 73 - 74 75 76 77 78
Deaths
... (In this case, the parabola does not intersect the x-axis at all.) Note that when computing roots numerically, the usual form of the quadratic formula is not ideal. See ...