The discriminant of a quadratic function in the form

ax^2 + bx + c = 0

is equal to

D = b^2 - 4ac

Since the square root of the discriminant is used in the quadratic formula in the form

\displaystyle x = \frac{-b \pm \sqrt{D}}{2a}

it can be used to determine how many roots the function has. If it is greater than zero, the function has two real roots, if it is equal to zero, the function has one, and if it is negative, the function will only have imaginary roots.

Ad blocker interference detected!

Wikia is a free-to-use site that makes money from advertising. We have a modified experience for viewers using ad blockers

Wikia is not accessible if you’ve made further modifications. Remove the custom ad blocker rule(s) and the page will load as expected.