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How will the roots of x² − 4x + 1 = 0 be?

Answer and explanation

Correct answer: Real, irrational and distinct

For a quadratic equation ax² + bx + c = 0, the discriminant D = b² − 4ac determines the nature of its roots. Here a = 1, b = −4 and c = 1, so D = (−4)² − 4(1)(1) = 16 − 4 = 12. Since D is positive, the equation has two real and distinct roots. Also, 12 is not a perfect square. Using the quadratic formula, the roots are (4 ± √12)/2 = 2 ± √3, and √3 is irrational. Therefore the roots are real, irrational and distinct, making option A correct. Option B is wrong because the roots are not rational; options C and D contradict the positive discriminant.

Related tags

Quadratic EquationsNature Of RootsDiscriminantMathematicsClass 10 Mcq

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