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If the discriminant of a quadratic equation with real coefficients is \(D=-9\), which statement about its roots is correct?

Answer and explanation

Correct answer: No real roots

For a quadratic equation, the discriminant is \(D=b^2-4ac\). If \(D<0\), the equation has no real roots. Here, \(D=-9<0\), so option A is correct. Option B requires \(D>0\), while option C requires \(D=0\). Exam tip: determine the nature of the roots by checking the sign of the discriminant.

Related tags

Quadratic EquationsNature Of RootsDiscriminantReal RootsNegative DiscriminantMathematicsClass 10 Mcq

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