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9th century BC

(10th century BC - 9th century BC - 8th century BC - other centuries)

(900s BC - 890s BC - 880s BC - 870s BC - 860s BC - 850s BC - 840s BC - 830s BC - 820s BC - 810s BC - 800s BC - other decades)

(2nd millennium BC - 1st millennium BC - 1st millennium AD)


Events:

Significant persons:

Inventions, Discoveries, Introductions



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Quadratic formula

... term b2 – 4ac is called the discriminant of the quadratic equation, because it discriminates between three qualitatively different cases: If the discriminant is ...

 
 
 
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