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Which of the following quadratic equations has real and equal roots?

Answer and explanation

Correct answer: \(x^2-8x+16=0\)

For a quadratic equation \(ax^2+bx+c=0\), the discriminant is \(D=b^2-4ac\). In option A, \(D=(-8)^2-4(1)(16)=64-64=0\), so its roots are real and equal. Options B and D have \(D>0\), giving two distinct real roots, while option C has \(D<0\), so it has no real roots. Exam tip: equal real roots occur exactly when \(D=0\).

Related tags

Quadratic EquationsNature Of RootsDiscriminantEqual RootsReal RootsMathematicsClass 10 Mcq

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