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If x² − 2(k − 3)x + k² − 6k + 9 = 0 is a quadratic equation, what is the nature of its roots for every real value of k?

Answer and explanation

Correct answer: Always real and equal

Since k² − 6k + 9 = (k − 3)², the equation becomes [x − (k − 3)]² = 0. It therefore has the repeated real root x = k − 3 for every real k, so the roots are always real and equal.

Related tags

Quadratic EquationsNature Of RootsDiscriminantMathematicsClass 10 Mcq

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