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A student writes the discriminant \(D=40\) for the equation \(x^2-4x+6=0\). What is the correct value of \(D\)?

Answer and explanation

Correct answer: -8

For a quadratic equation \(ax^2+bx+c=0\), the discriminant is \(D=b^2-4ac\). Here, \(a=1\), \(b=-4\), and \(c=6\), so \(D=(-4)^2-4(1)(6)=16-24=-8\). Therefore, option A is correct. As an exam tip, remember that \(D<0\) means the equation has no real roots; 16 is only the value of \(b^2\).

Related tags

Quadratic-EquationsDiscriminantNature-Of-RootsCommon-MistakesNature Of RootsQuadratic EquationsMathematicsClass 10 Mcq

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