This cheat sheet covers the high school math concept – Quadratic Equations.

This concept is one of the important and interesting ones under Algebra. Quadratic equations come up when we deal with many real-life situations.

Babylonian mathematicians, as early as 2000 BC, could solve problems relating the areas and sides of rectangles. The problems typically involved solving a pair of simultaneous equations of the form : x + y = p, xy = q, which are equivalent to the equation x^{2} – px + q = 0. In 628 AD, Brahmagupta, an Indian mathematician, gave the first explicit solution of the quadratic equation ax^{2} + bx = c. In 1637, René Descartes published La Geometrie containing the quadratic formula in the form we know today.

A good knowledge of plotting graphs of functions will help quite a bit in solving problems related to quadratic equations. Cheat sheets on Graph Transformations (Basic and Advanced) are also available on this website.

This one page PDF covers summarised theory and the most important formulas related to the concept. Keep it handy while you’re revising the concept, especially before an exam.

The topics included in this cheat sheet are:

- Nature of Roots of Quadratic Equations
- Real and Distinct Roots
- Real and Equal Roots
- Imaginary Roots
- Rational Roots
- Integral Roots
- Relation Between Roots and Coefficients
- Common Roots
- Range of a Quadratic Function
- Sign of a Quadratic Function
- Graph of a Quadratic Function
- Location of the Roots of Quadratic Equations

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