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Which of the following quadratic equations will have no real roots?

Answer and explanation

Correct answer: x² + 3x + 5 = 0

For a quadratic equation ax² + bx + c = 0, the discriminant is D = b² − 4ac. In option A, D = 3² − 4(1)(5) = −11 < 0, so the equation has no real roots. Options B and D have D > 0 and therefore two distinct real roots, while option C has D = 0 and therefore two equal real roots. Exam tip: check the sign of the discriminant first to determine the nature of the roots.

Related tags

Quadratic EquationsDiscriminantNature Of RootsReal RootsMathematicsClass 10 Mcq

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