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Algebra is a old science invented by a well known expect Al Khwarizmi. It deals with variables and symbolic relationships.
One of the most recent (200 years old) concepts in algebra is that of a QUADRATIC EQUATION. I mean ax^2+bx+c = 0.
Quadratic equtions are used all over the world for different purposes. If the discriminant is greater than zero, there are two solutions, if it is zero, there is only one solution, otherwise there are no solitions.