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What is the sign of the discriminant \(D\) for the quadratic equation \(2x^2-x+4=0\)?

Answer and explanation

Correct answer: Negative \(D<0\)

Here, \(a=2\), \(b=-1\), and \(c=4\). Thus, the discriminant is \(D=b^2-4ac=(-1)^2-4(2)(4)=1-32=-31\). Since \(D<0\), its sign is negative, and the equation has no real roots. In an exam, check the sign of \(b\) carefully before substituting in \(b^2-4ac\).

Related tags

Quadratic EquationsDiscriminantNature Of RootsNegative DiscriminantMathematicsClass 10 Mcq

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