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What condition on k is required for the equation 4x² − 4(k + 1)x + (k² + 2k) = 0 to have real roots?

Answer and explanation

Correct answer: All real values

For a quadratic equation, the discriminant is D = b² − 4ac. Here, a = 4, b = −4(k + 1), and c = k² + 2k. Thus, D = 16(k + 1)² − 16(k² + 2k) = 16. Since D = 16 > 0 for every real value of k, the equation has two distinct real roots for every real k. Therefore, option A is correct. Exam tip: In parameter-based quadratic questions, simplify the discriminant completely before deciding the condition on the parameter.

Related tags

Quadratic EquationsDiscriminantNature Of RootsParameter-Based EquationsMathematicsClass 10 Mcq

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