If X- 6 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 0. B-The discriminant is 6. C-The discriminant is positive. D-The discriminant is negative.
The rule, letting d=discriminant: d>0, two real solutions d=0, one real solution d<0, no real solution (but there are two imaginary solutions) So if it has only one real solution, the discriminant is equal to zero.