Question

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.

Answer 1

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.

Answer 2

in short the anwser is A

Explanation: