Mathematics · Theory of Equations
The cubic equation x3 + qx + r = 0 has two equal roots if and only if:
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- 127q2 + 4r3 = 0
- 227r2 + 8q3 = 0
- 327q2 + 8r3 = 0
- 427r2 + 4q3 = 0✓
Correct answer
27r2 + 4q3 = 0
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