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If the two roots of the equation \(x^2+kx+9=0\) are equal, which value of \(k\) is possible?

Answer and explanation

Correct answer: 6

For equal roots, the discriminant must be zero. Thus, \(k^2-4(1)(9)=0\), giving \(k^2-36=0\) and hence \(k=6\) or \(k=-6\). Among the given options, only 6 is listed, so option A is correct. Exam tip: For equal roots of a quadratic equation, always set \(b^2-4ac=0\).

Related tags

Quadratic EquationsNature Of RootsDiscriminantEqual RootsParameterMathematicsClass 10 Mcq

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