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A student assumes that a quadratic equation has two real roots when its discriminant is D = -4. What is the correct conclusion?

Answer and explanation

Correct answer: There will be no real roots

For a quadratic equation, the discriminant is D = b² − 4ac. When D < 0, the equation has no real roots; here, D = −4. Option C is incorrect because equal real roots require D = 0, while two distinct real roots require D > 0. Exam tip: check the sign of the discriminant—negative, zero and positive indicate no real roots, equal roots and distinct real roots, respectively.

Related tags

Quadratic EquationsDiscriminantNature Of RootsReal RootsCommon MistakesMathematicsClass 10 Mcq

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