Question

If x= -3 is the only x-intercept of the graph of a quadratic equation, which statement best describes the discriminant of the equation?

A) The discriminant is negative.
B) The discriminant is -3.
C) The discriminant is 0.
D) The discriminant is positive.

Answer 1

C) The discriminant is 0.

Explanation:

Since the graph of the quadratic equation has only one x-intercept, we can conclude that the quadratic has only one real root.

If a quadratic equation has only one real root, then the discriminant is 0