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If D = b² − 4ac is positive but not a perfect square, what is the most accurate nature of the roots of ax² + bx + c = 0?

Answer and explanation

Correct answer: Two real, irrational and distinct roots

The governing criterion is the discriminant of a quadratic equation. The quadratic formula gives roots x = (−b ± √D)/(2a), with a ≠ 0. Since D > 0, √D is positive and the plus and minus choices produce two distinct real roots. If D were a perfect square, rational coefficients would generally lead to rational roots, but the question states that D is not a perfect square; therefore √D is irrational, making the roots irrational in the standard school-level setting with rational coefficients. D = 0 would instead give equal roots, and D < 0 would give no real roots. Hence option A precisely describes the roots.

Related tags

Quadratic EquationsDiscriminantNature Of RootsMathematicsClass 10 Mcq

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