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For the roots of the equation \(2x^2+kx+2=0\) to be equal, what must be the value of \(k^2\)?

Answer and explanation

Correct answer: 16

For a quadratic equation to have equal roots, its discriminant must be zero. Here, \(a=2\), \(b=k\), and \(c=2\), so \(D=b^2-4ac=k^2-4(2)(2)=k^2-16\). Thus, \(k^2-16=0\), giving \(k^2=16\). Exam tip: For equal-root questions, immediately use the condition \(b^2-4ac=0\).

Related tags

Quadratic EquationsEqual RootsDiscriminantNature Of RootsMathematicsClass 10 Mcq

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