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If the two roots of x² − 2(a + b)x + 4ab = 0 are equal, which relation must be true?

Answer and explanation

Correct answer: a = b

Equal roots require the discriminant to be zero. Here, Δ = [−2(a + b)]² − 4(1)(4ab) = 4(a + b)² − 16ab = 4(a − b)². Setting Δ = 0 gives (a − b)² = 0, so a = b. The other listed relations are not necessary; for example, a = b = 1 gives equal roots but neither ab = 0 nor a + b = 0.

Related tags

Quadratic EquationsDiscriminantEqual RootsNature Of RootsMathematicsClass 10 Mcq

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