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Which expression is used to determine the nature of the roots of the quadratic equation \(ax^2+bx+c=0\)?

Answer and explanation

Correct answer: \(b^2-4ac\)

The discriminant of \(ax^2+bx+c=0\) is \(D=b^2-4ac\). It determines the nature of the roots: \(D>0\) gives two distinct real roots, \(D=0\) gives equal real roots, and \(D<0\) gives no real roots. Therefore, option A is correct; the other expressions are not the discriminant formula. Exam tip: identify the coefficients \(a,b,c\) correctly before substituting their values.

Related tags

Quadratic EquationsNature Of RootsDiscriminantReal RootsMathematicsClass 10 Mcq

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