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Decades: 700s BC 690s BC 680s BC 670s BC 660s BC - 650s BC - 640s BC 630s BC 620s BC 610s BC 600s BC
Significant People
... solution(s) x to the quadratic equation <math>ax^2+bx+c=0</math> in terms of the coefficients a, b and c, which are assumed to be real (but see below fo ...