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What is the value of the discriminant \(D\) for the equation \(x^2+3x+7=0\)?

Answer and explanation

Correct answer: -19

For a quadratic equation \(ax^2+bx+c=0\), the discriminant is \(D=b^2-4ac\). Here, \(a=1, b=3, c=7\), so \(D=3^2-4(1)(7)=9-28=-19\). Therefore, option A is correct. Exam tip: a negative discriminant means that the equation has no real roots; 19 results from missing the negative sign.

Related tags

Quadratic EquationsDiscriminantNature Of RootsNo Real RootsClass 10 MathematicsMathematicsClass 10 Mcq

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