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What is the sign of the discriminant \(D\) for the equation \(x^2+x+1=0\)?

Answer and explanation

Correct answer: Negative (\(D<0\))

For a quadratic equation \(ax^2+bx+c=0\), the discriminant is \(D=b^2-4ac\). Here, \(a=1,b=1,c=1\), so \(D=1^2-4(1)(1)=-3\), which is negative. Therefore, option A is correct. The discriminant would be zero only if \(D=0\), which is not the case here. Exam tip: when \(D<0\), the quadratic equation has no real roots.

Related tags

Quadratic EquationsDiscriminantNature Of RootsNo Real RootsMathematicsClass 10 Mcq

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