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Find the value of the discriminant \(D\) for the quadratic equation \(5x^2+2x+1=0\).

Answer and explanation

Correct answer: -16

For a quadratic equation \(ax^2+bx+c=0\), the discriminant is \(D=b^2-4ac\). Here, \(a=5\), \(b=2\), and \(c=1\), so \(D=2^2-4(5)(1)=4-20=-16\). Therefore, option A is correct; since \(D<0\), the equation has no real roots. Exam tip: identify \(a\), \(b\), and \(c\) carefully, including their signs, before applying the formula.

Related tags

Quadratic EquationsDiscriminantNature Of RootsReal RootsClass 10MathematicsClass 10 Mcq

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