Quadratic Equation  Introduction       

If p(x) is a polynomial of degree 2, of any equation in the form p(x) = 0, is a Quadratic equation.

But when we write the terms of polynomial p(x) in descending order of their degree, then we get the standard form of a Quadratic equation. that is 

                “ax² + bx + c = 0″, a ≠ 0.

A Quadratic equation is an equation in standard form 
                   “ax² + bx + c = 0″, 

where x is Example, a, b, c, are real numbers, and a ≠ 0.

Example- (1) x² – 4x + 5 = 0

               (2) x²  + 3x – 4 = 0

               (3) 3x²  + 5x – 7 = 0 are Quadratic equations.