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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)


Significant persons:

Inventions, Discoveries, Introductions

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Quadratic formula

... the method of completing the square[?]. <math>ax^2+bx+c=0</math> Dividing our quadratic equation by a, we have <math> x^2 + \left( \frac{b}{a} ...

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