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Assertion: The quadratic equation \(x^2+3x+7=0\) has no real roots.
Reason: If the discriminant \(D\) of a quadratic equation is less than zero, then it has no real roots.
Choose the correct option.

Answer and explanation

Correct answer: Both the assertion and the reason are correct

Here, \(a=1\), \(b=3\), and \(c=7\). Thus, the discriminant is \(D=b^2-4ac=3^2-4(1)(7)=9-28=-19\). Since \(D<0\), the equation has no real roots, so the assertion is correct. This same discriminant criterion makes the reason correct as well. Exam tip: When \(D<0\), the roots are non-real conjugates.

Related tags

Quadratic-EquationsDiscriminantNature-Of-RootsAssertion-ReasonNature Of RootsQuadratic EquationsMathematicsClass 10 Mcq

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