**Introduction of Quadratic Equations**

An equation of the form a_{n}x^{n} + a_{n – 1}x^{n – 1} + a_{n – 2}x^{n – 2} + …. + a_{1}x + a_{0} = 0 (a_{0}, a_{1}…., a_{n} are real coefficients and a_{n} ≠ 0) is called a polynomial equation of degree n. This equation is called a linear equation if n=1, quadratic equation if n=2, cubic equation if n=3, bi-quadratic equation if n=4…and so on.

**DEFINITION**

An equation of the form ax^{2} + bx + c = 0, where a ≠ 0 and a, b, c are real numbers, is called a quadratic equation. The numbers a, b, c are called the coefficients of the quadratic equation.

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