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974

Centuries: 9th century - 10th century - 11th century

Decades: 920s 930s 940s 950s 960s - 970s - 980s 990s 1000s 1010s 1020s

Years: 969 970 971 972 973 - 974 - 975 976 977 978 979

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Quadratic formula

... of b/(2a) to both sides, getting <math>x^2+\frac{b}{a}x+\frac{b^2}{4a^2}=-\frac{c}{a}+\frac{b^2}{4a^2}.</math> The left side is now a perfect square; ...