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If the roots of the quadratic equation \(3x^2-2kx+27=0\) are equal, what are the possible values of \(k\)?

Answer and explanation

Correct answer: \(k=\pm9\)

For equal roots, the discriminant must be zero: \(D=b^2-4ac=0\). Here, \(a=3\), \(b=-2k\), and \(c=27\), so \((-2k)^2-4(3)(27)=0\), giving \(4k^2=324\). Hence \(k^2=81\), and therefore \(k=\pm9\). Thus, option A is correct. Exam tip: For equal roots of a quadratic equation, set the discriminant equal to zero.

Related tags

Quadratic EquationsNature Of RootsDiscriminantParameterMathematicsClass 10 Mcq

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