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If m is a real number and the equation x² + 2(m − 5)x + (m² − 9m + 24) = 0 has no real roots, which condition on m is correct?

Answer and explanation

Correct answer: m > 1

Here, a = 1, b = 2(m − 5), and c = m² − 9m + 24. Therefore, the discriminant is D = b² − 4ac = 4(m − 5)² − 4(m² − 9m + 24) = 4(1 − m). For the equation to have no real roots, D must be less than zero. Thus, 4(1 − m) < 0 gives m > 1. When m = 1, D = 0, so the equation has two equal real roots; hence option C is incorrect. Exam tip: For a quadratic equation, remember that no real roots occur when D < 0.

Related tags

Quadratic-EquationsNature-Of-RootsDiscriminantParameter-Based-EquationsNo-Real-RootsNature Of RootsQuadratic EquationsMathematics

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