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For a quadratic equation ax² + bx + c = 0, the discriminant is:
Ab² + 4ac
Bb² − 4ac
C(a + b + c)²
D4ac − b²
Answer & Solution
Correct answer: B. b² − 4ac
1. A quadratic ax² + bx + c = 0 has discriminant D = b² − 4ac.
2. D > 0 gives two real distinct roots; D = 0 gives equal real roots; D < 0 gives complex roots.
3. The discriminant is part of the quadratic formula x = (−b ± √D) / 2a.
_Source: ICMAI BoS CMA Foundation Paper 3 (Business Mathematics & Statistics), Module 2 §2.2 (Indices and Logarithms) + Module 5 (Standard Deviation), p. 112-160 + 318-340_