Quadratic Formula Calculator

Enter the coefficients of x in the quadratic formula and equation calculator to find its roots.

Quadratic Formula

ax² + bx + c = 0

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This advanced quadratic equation and formula solver computes the roots of a quadratic equation. It also gives the detail of the whole process along with a plotted graph.

What is a Quadratic equation?

Quadratic means involving the power of two. A quadratic equation is:

“ A polynomial expression which has the maximum degree of variable as 2.”

A quadratic equation is of the form ax+ bx + c = 0. Where a, b, and c are the coefficients and are known. While variables like “x” are unknown.

Quadratic equation formula

To find the values of X, roots, we use a formula known as the quadratic formula:


Where (b2 - 4ac) is known as a discriminant.

Nature of the roots

The value of the discriminant determines the nature of the roots whether they are real or imaginary (complex) roots. Here is a guide to learn it beforehand:

  • If discriminant > 0 , roots are real
  • If discriminant = 0, one real root
  • If discriminant < 0, imaginary roots

How to solve Quadratic equations?


Solve 6x2 + 4x + 2 = 0.


Step 1: Identify the Coefficients.

a = 6, b = 4 and c = 2

Step 2: Use the quadratic formula.


So, the roots are complex. These radicals can be further solved as


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