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If the quadratic equation \(kx^2-26x+169=0\) has equal roots, what is the value of \(k\)?

Answer and explanation

Correct answer: 1

For equal roots, the discriminant must be zero: \(D=b^2-4ac=0\). Here, \(a=k\), \(b=-26\), and \(c=169\). Thus, \(D=(-26)^2-4(k)(169)=676-676k=0\), giving \(k=1\). Values such as \(13\) or \(169\) do not make the discriminant zero. Exam tip: For equal roots in a parameter-based quadratic equation, immediately apply \(b^2-4ac=0\).

Related tags

Quadratic EquationsDiscriminantEqual RootsParameterMethods Of Solving Quadratic EquationsMathematicsClass 10 Mcq

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