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What is the value of the discriminant \(D\) for the equation \(x^2+4x+8=0\)?

Answer and explanation

Correct answer: -16

For a quadratic equation \(ax^2+bx+c=0\), the discriminant is \(D=b^2-4ac\). Here, \(a=1\), \(b=4\), and \(c=8\), so \(D=4^2-4(1)(8)=16-32=-16\). Therefore, the correct answer is -16. Choosing 16 results from a sign error. Exam tip: when \(D<0\), the roots are not real.

Related tags

Quadratic EquationsDiscriminantNature Of RootsNegative DiscriminantMathematicsClass 10 Mcq

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