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20s BC

Centuries: 2nd century BC - 1st century BC - 1st century

Decades: 70s BC 60s BC 50s BC 40s BC 30s BC - 20s BC - 10s BC 0s BC 0s 10s 20s

Years: 29 BC 28 BC 27 BC 26 BC 25 BC 24 BC 23 BC 22 BC 21 BC 20 BC

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Quadratic formula

... the parabola intersects the x-axis in two points.) If the discriminant is negative, then there are two different solutions x, both of which are complex numbers. The tw ...