Question #N511
The equation $ax^2 + bx + c = 0$ has exactly one solution. What is the value of $b^2 - 4ac$?
A. -1
B. 0
C. 1
D. 4
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Correct Answer is: B
A quadratic equation has exactly one solution when its discriminant is equal to zero. The discriminant of the quadratic equation $ax^2 + bx + c = 0$ is $b^2 - 4ac$. Therefore, the value of $b^2 - 4ac$ must be 0.