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660s BC

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

... left side is now a perfect square; it is the square of (x + b/(2a)). The right side can be written as a single fraction; the ...

 
 
 
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