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Decades: 570s BC - 560s BC - 550s BC - 540s BC - 530s BC - 520s BC - 510s BC - 500s BC - 490s BC - 480s BC - 470s BC
Significant People
... solution x, and this solution is real. (Geometrically, this means that the parabola described by the quadratic equation touches the x-axis in a single point.) If ...