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What is the sign of the discriminant (D) of the equation \(2x^2+4x+2=0\)?

Answer and explanation

Correct answer: zero

Here, \(a=2\), \(b=4\), and \(c=2\). Thus, \(D=b^2-4ac=4^2-4(2)(2)=16-16=0\). Therefore, the discriminant is zero, and the equation has two equal real roots. Choosing positive or negative is incorrect. Exam tip: when \(D=0\), the roots are real and equal.

Related tags

Quadratic EquationsDiscriminantNature Of RootsMathematicsClass 10 Mcq

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