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If the equation \(x^2+2gx+g^2-6g+11=0\) has real roots, what condition must \(g\) satisfy?

Answer and explanation

Correct answer: \(g\ge\frac{11}{6}\)

For a quadratic equation to have real roots, its discriminant must satisfy \(D\ge0\). Here, \(a=1\), \(b=2g\), and \(c=g^2-6g+11\). Thus, \(D=(2g)^2-4(g^2-6g+11)=24g-44\). Therefore, \(24g-44\ge0\), giving \(g\ge\frac{11}{6}\). At \(g=\frac{11}{6}\), the roots are equal and real, so option B is incorrect because it excludes this boundary value. Exam tip: For questions about real roots, begin by applying \(D\ge0\).

Related tags

Quadratic EquationsDiscriminantNature Of RootsReal RootsMathematicsClass 10 Mcq

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