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139

Centuries: 1st century - 2nd century - 3rd century

Decades: 90s - 100s - 110s - 120s - 130 - 140s - 150s - 160s - 170s - 180s - 190s - 200s

Years: 134 135 136 137 138 139 140 141 142 143 144

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Zhang Heng, Chinese mathematician

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Quadratic formula

... is positive, then there are two different solutions x, both of which are real. (Geometrically, this means that the parabola intersects the x-axis in two points.) If ...