**Quadratic equation - Wikipedia**
https://en.wikipedia.org/wiki/Quadratic_equation

A quadratic equation with real or complex coefficients has two solutions, called roots.These two solutions may or may not be distinct, and they may or may not be real. Factoring by inspection. It may be possible to express a quadratic equation ax 2 + bx + c = 0 as a product (px + q)(rx + s) = 0.In some cases, it is possible, by simple inspection, to determine values of p, q, r, and s that make ...

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