Quadratic equations are nothing more than second degree polynomials and, usually, they come in the form of **y = ax² + bx + c.**

There are many methods to solve second degree polynomial equations but, the most used one is the application of the Bhaskara formula, also known as the quadratic formula:

The **discriminant** of the quadratic equation is the part that is below the square root of the quadratic formula. In some books, the **discriminant** is represented by the greek letter Δ (delta), and Δ = b^{2} – 4ac. The discriminant can be positive, negative or equal to 0 (zero) such as:

- if b
^{2}-4ac > 0, the equation has two distinct real solutions (x1 ≠ x2); - if b
^{2}-4ac = 0, the equation has only one real solution (x1 = x2); - if b
^{2}-4ac < 0, the equation has no real solutions;