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Which of the following values of \(k\) can make the equation \(x^2+kx+16=0\) have equal real roots?

Answer and explanation

Correct answer: 8

For a quadratic equation \(ax^2+bx+c=0\) to have equal real roots, its discriminant must be zero: \(D=b^2-4ac=0\). Here \(a=1\), \(b=k\), and \(c=16\), so \(D=k^2-64=0\), giving \(k=\pm 8\). Since only 8 appears among the options, option A is correct. Exam tip: set the discriminant equal to zero whenever equal roots are required.

Related tags

Quadratic EquationsNature Of RootsDiscriminantEqual RootsParameterMathematicsClass 10 Mcq

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