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If the two roots of the equation \(x^2-2kx+16=0\) are equal, what is the value of \(k^2\)?

Answer and explanation

Correct answer: 16

For equal roots, the discriminant must be \(\Delta=0\). Here, \(a=1\), \(b=-2k\), and \(c=16\), so \(\Delta=b^2-4ac=(-2k)^2-4(1)(16)=0\). Thus, \(4k^2-64=0\), giving \(k^2=16\). The value 8 is incorrect because simplifying the equation still leads to \(k^2=16\). Exam tip: For equal roots of a quadratic equation, set \(b^2-4ac=0\).

Related tags

Quadratic EquationsNature Of RootsDiscriminantEqual RootsParameterMathematicsClass 10 Mcq

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