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ACCUPLACER
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Discriminant and Number of Solutions
Grade Level
ACCUPLACER
AAF.049 Discriminant and Number of Solutions
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For zx
2
+ 10x + z = 0 with z != 0, which statement correctly uses the discriminant to determine when the quadratic has two real solutions?
A
b
2
- 4ac = 100 + 4z
2
, so two real solutions occur for every z != 0.
B
b
2
- 4ac = 100 - 4z
2
, so two real solutions occur when z < -5 or z > 5.
C
b
2
- 4ac = 100 - 4z
2
, so two real solutions occur when -5 < z < 5 and z != 0.
D
b
2
- 4ac = 4z
2
- 100, so two real solutions occur when -5 < z < 5 and z != 0.
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