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The discriminant of ax² + bx + c equals which expression of the roots α, β?
Aa²(α - β)²
B(α - β)²
Ca(α - β)²
D(α + β)²
Answer & Solution
Correct answer: A. a²(α - β)²
(α - β)² = (b² - 4ac)/a², so the discriminant is a² times the squared difference of the roots.
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