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Use the Discriminant to Classify Real Solutions
Grade Level
GRE
QR.123 Use the Discriminant to Classify Real Solutions
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For ax
2
+ 6x + 3 = 0 with a = 3, what real-solution classification is indicated by D?
A
The discriminant cannot be used unless the roots are already known.
B
D = 85, so the equation has two distinct real solutions.
C
D = -85, so the equation has no real solutions.
D
D = 6
2
- 4(3)(3) = 0, so the equation has one repeated real solution.
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