Question: What is the discriminant of the quadratic equation x^2 - 6x + 9?

Options:

1. 0
2. 1
3. 4
4. 9

Correct Answer: 0

Solution:

The discriminant is given by b^2 - 4ac. Here, a = 1, b = -6, and c = 9. So, the discriminant is (-6)^2 - 4(1)(9) = 36 - 36 = 0.