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977

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

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

Years: 972 973 974 975 976 - 977 - 978 979 980 981 982

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Hunain ibn Ishaq, Egyptian physician

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Quadratic formula

... both of which are real. (Geometrically, this means that the parabola intersects the x-axis in two points.) If the discriminant is negative, then there are two different ...