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660s BC

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Centuries: 8th century BC - 7th century BC - 6th century BC

Decades: 710s BC 700s BC 690s BC 680s BC 670s BC - 660s BC - 650s BC 640s BC 630s BC 620s BC 610s BC


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Quadratic formula

... (b/a)x, we must have y = b/(2a), so we add the square of b/(2a) to both sides, ...

 
 
 
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