Maths Exercises
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Maths Exercices
The discriminant
The general form of a quadratic equation is .
A quadratic equation with real coefficients can have none, one or two distinct real roots.
To determine the number of roots we use the discriminant:
b2-4ac


a) b2-4ac > 0 The equation has two solutions.

b) b2-4ac < 0 The equation has no solution.

c) b2-4ac = 0 The equation has one solution.

(If the discriminant is negative, the roots are complex, and this page can not display the complex number. The output will be "None")

How many roots does the following equation have?

None One Two