Centuries: 9th century - 10th century - 11th century
Decades: 880s 890s 900s 910s 920s - 930s - 940s 950s 960s 970s 980s
Years: 929 930 931 932 933 - 934 - 935 936 937 938 939
Births
Deaths
... we must have y = b/(2a), so we add the square of b/(2a) to both sides, ...