# Quadratic Equation Solver Online [Calculator]

The formula to solve a quadratic equation is

-b + √(b^{2}- 4ac) r = ______________ 2a

**Note:**We will add the support for complex roots soon.

The term

**b**is called as discriminant and is of very importance. Depending on the value of discriminant we can tell the nature of the roots of the quadratic equation where a, b and c are the rational numbers.

^{2}- 4ac
If value of discriminant (d) is

The discriminant is useful if we want to know the nature of the roots instead of actually calculating them.**Zero (0)**- the equation has real root**greater than zero (d > 0)**- the equation has real and distinct roots**less than zero (d < 0)**- the equation has imaginary roots

If you want C programming language code to find roots of quadratic equation check out this article at C program to find roots of a quadratic equation.