1. History of the Quadratic Equation
In about 300 BC Euclid developed a geometrical approach which, although later mathematicians used it to solve quadratic equations, amounted to finding a length which in our notation was the root of a quadratic equation. ... Most notably, Brahmagupta, who lived from 598 - 665 BC, developed the first system of numbers that used zero. This system, a treatise called Brhma-sphuta-siddhnta, stated that a-a=0, and also considers the fractions x/0, which he sets equal to 0 for x=0 and otherwise calls nought, a term of uncertain meaning. ... The treatise develops a system for the solutions of quadrati...
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