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What is the value of the discriminant \(D\) of the quadratic equation \(3x^2+2x+1=0\)?

Answer and explanation

Correct answer: -8

For a quadratic equation \(ax^2+bx+c=0\), the discriminant is \(D=b^2-4ac\). Here, \(a=3\), \(b=2\), and \(c=1\), so \(D=(2)^2-4(3)(1)=4-12=-8\). Therefore, option A is correct. Choosing 8 usually results from missing the minus sign in \(-4ac\). Exam tip: identify \(a\), \(b\), and \(c\) first, then substitute them carefully.

Related tags

Quadratic EquationsDiscriminantNature Of RootsReal RootsQuadratic FormulaMathematicsClass 10 Mcq

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