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If \(a<0\), \(c<0\), and \(b=0\), what is the nature of the roots of the quadratic equation \(ax^2+c=0\)?

Answer and explanation

Correct answer: No real roots

For the quadratic equation \(ax^2+bx+c=0\), here \(b=0\) and \(a<0, c<0\), so \(ac>0\). Therefore, the discriminant is \(D=b^2-4ac=0-4ac<0\), which means that the equation has no real roots. Option B would require \(D=0\), which is not the case here. Exam tip: if \(D<0\), the roots are not real.

Related tags

Quadratic-EquationsNature-Of-RootsDiscriminantSign-AnalysisNo-Real-RootsNature Of RootsQuadratic EquationsMathematics

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