Home » All Calculators » Academic and Education Tools » Discriminant Calculator

Discriminant Calculator

Photo of author
Published on

A Discriminant Calculator is a powerful tool designed to make the life of students, educators, and anyone dealing with quadratic equations much easier. By swiftly determining the nature of the roots of any quadratic equation, it sheds light on the equation’s characteristics without the need for tedious calculations. This article delves into the workings, definition, and formula of the Discriminant Calculator, offering a simple guide to its use and benefits.

What is the Discriminant?

The discriminant is a part of the quadratic formula used to solve equations of the form 2+0ax2+bx+c=0. It is denoted by D and is calculated using the formula:


Here, a, b, and c are coefficients from the quadratic equation, where a is the coefficient of 2x2, b is the coefficient of x, and c is the constant term.

The value of the discriminant tells us about the nature of the roots of the equation:

  • If >0D>0, the equation has two distinct real roots.
  • If =0D=0, the equation has exactly one real root, also known as a repeated or double root.
  • If <0D<0, the equation has no real roots, indicating two complex roots.

Functionality of the Discriminant Calculator

The Discriminant Calculator simplifies the process of calculating D by automating the computation. Users only need to input the values of a, b, and c, and the calculator does the rest, including validating the inputs and providing the discriminant’s value along with insights into the nature of the equation’s roots.

Step-by-Step Example

Let’s solve a quadratic equation: 22−4−6=02x2−4x−6=0.

  1. Input the coefficients: 2a=2, =−4b=−4, =−6c=−6.
  2. Calculate the discriminant using 2−4D=b2−4ac: =(−4)2−4(2)(−6)=16+48=64D=(−4)2−4(2)(−6)=16+48=64.
  3. Output the value of D: =64D=64.

Since >0D>0, the equation has two distinct real roots.

Relevant Information Table

CoefficientSymbolExample Value
Coefficient of 2x2a2
Coefficient of xb-4
Constant termc-6
Discriminant (D)64


The Discriminant Calculator is an invaluable tool for anyone dealing with quadratic equations. It not only streamlines the calculation process but also enhances understanding by clearly indicating the nature of the equation’s roots. This simple yet effective tool can significantly aid in educational settings, making it easier for students to grasp complex mathematical concepts and for educators to explain these concepts with clarity. Whether for academic purposes or personal curiosity, the Discriminant Calculator is a reliable assistant in the world of mathematics.

Leave a Comment