Centuries: 1st century BC - 1st century - 2nd century
Decades: 10s BC - 0s - 10s - 20s - 30s - 40s - 50s - 60s - 70s - 80s - 90s
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Siginificant People
... described by the quadratic equation touches the x-axis in a single point.) If the discriminant is positive, then there are two different solutions x, both of which are ...