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If the discriminant D = 49, what is the nature of the roots of the quadratic equation?

Answer and explanation

Correct answer: Two distinct real roots

The discriminant determines the nature of the roots of a quadratic equation ax² + bx + c = 0. Its value is D = b² − 4ac. If D > 0, the equation has two distinct real roots; if D = 0, it has two equal real roots; and if D < 0, it has no real roots. Here D = 49, and 49 is positive. Therefore the equation has two distinct real roots, making option A correct. Although equal roots may sometimes be described informally as one repeated value, that situation requires D = 0, not D = 49. A positive discriminant also means the square root term in the quadratic formula is nonzero, so the two values of x are different.

Related tags

Quadratic-EquationsDiscriminantNature-Of-RootsNature Of RootsQuadratic EquationsMathematicsClass 10 Mcq

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