College Algebra CLEP Prep Practice Exam

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What is the discriminant of the equation x2 - 6x + 9 = 0?

The correct answer is: -12

The discriminant of a quadratic equation in the form ax2 + bx + c = 0 is given by the expression b2 - 4ac. In this equation, a = 1, b = -6 and c = 9. Therefore, the discriminant is (-6)2 - 4(1)(9) = 36 - 36 = 0. This means that the equation has only 1 real root. The other options are incorrect because A and B values do not match the calculations for a discriminant, and C is the value of the discriminant for an equation with only 1 real root.