Decades: 970s 980s 990s 1000s 1010s - 1020s - 1030s 1040s 1050s 1060s 1070s
Years: 1015 1016 1017 1018 1019 - 1020 - 1021 1022 1023 1024 1025
Births
Deaths
... then there are two different solutions x, both of which are real. (Geometrically, this means that the parabola intersects the x-axis in two points.) If the ...