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If the discriminant of a quadratic equation is \(D=18\), what is the nature of its roots?

Answer and explanation

Correct answer: Two real, distinct and irrational roots

The discriminant \(D=18\) is positive, so the roots are real and distinct. Since 18 is not a perfect square, the roots are irrational. Option B is incorrect because distinct real roots are rational only when the discriminant is a perfect square. Exam tip: \(D>0\) gives distinct real roots, \(D=0\) gives equal roots, and \(D<0\) gives no real roots.

Related tags

Quadratic-EquationsDiscriminantNature-Of-RootsIrrational-RootsNature Of RootsQuadratic EquationsMathematicsClass 10 Mcq

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