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

Answer and explanation

Correct answer: 16

For a quadratic equation \(ax^2+bx+c=0\), the discriminant is \(D=b^2-4ac\). Here, \(a=1\), \(b=-2\), and \(c=-3\), so \(D=(-2)^2-4(1)(-3)=4+12=16\). Since \(c\) is negative, the term \(-4ac\) becomes positive; therefore, 8 and -16 are incorrect. In an exam, identify the signs of \(a\), \(b\), and \(c\) before substituting.

Related tags

Quadratic EquationsDiscriminantNature Of RootsSign ErrorsMathematicsClass 10 Mcq

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