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Which option is correct about the roots of 5x² − 3√5x + 6 = 0?

Answer and explanation

Correct answer: No real roots; D = −75

The governing concept is the discriminant D = b² − 4ac. For 5x² − 3√5x + 6 = 0, the coefficients are a = 5, b = −3√5, and c = 6. Hence b² = (−3√5)² = 9 × 5 = 45, while 4ac = 4 × 5 × 6 = 120. Therefore D = 45 − 120 = −75. A negative discriminant means the equation has no real roots; its roots are a complex conjugate pair. D = 0 would describe equal real roots, while positive values would indicate two distinct real roots. Consequently option A is correct. The numerical discriminants quoted in options B, C, and D are also inconsistent with the actual calculation.

Related tags

Quadratic EquationsDiscriminantNo Real RootsNature Of RootsMathematicsClass 10 Mcq

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