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If the two roots of the equation \(x^2-2(m+1)x+16=0\) are equal, what are the possible values of \(m\)?

Answer and explanation

Correct answer: \(m=3\) या \(m=-5\)

For equal roots, the discriminant must be zero. Here, \(a=1\), \(b=-2(m+1)\), and \(c=16\). Thus, \(D=b^2-4ac=[-2(m+1)]^2-64=0\), giving \((m+1)^2=16\). Hence, \(m+1=\pm4\), so \(m=3\) or \(m=-5\). Exam tip: In questions involving equal roots of a quadratic equation, begin by using \(D=0\).

Related tags

Quadratic EquationsNature Of RootsDiscriminantParameterMathematicsClass 10 Mcq

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