In algebra, what is a double root?

When a second-degree polynomial touches the x-axis but does not cross it, it is called a double root. The parabola extends up or down from the double root on the x-axis at both ends.

Mathematically, a double root can be confirmed by looking at the equation for solving a second-degree polynomial. The equation has a double root if the discriminant, or square root of b2-4*a*c, is equal to zero. When you finish calculating the equation’s solution, you’ll have two solutions with the same magnitude. Other polynomial problem solutions include having two roots with two x-axis intersections, or having no roots if the x-axis is not crossed.


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