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A quadratic equation with rational coefficients has discriminant D = 18. A student writes that its roots are rational. What is the correct correction?

Answer and explanation

Correct answer: The roots will be real, distinct, and irrational

Since D = 18 > 0, the roots are real and distinct. Also, 18 is not a perfect square, and √18 = 3√2 is irrational. Therefore, for a quadratic equation with rational coefficients, the roots are irrational. The student’s statement that the roots are rational is incorrect. Exam tip: D > 0 indicates real and distinct roots, while whether D is a perfect square determines their rationality.

Related tags

Quadratic EquationsNature Of RootsDiscriminantIrrational RootsMathematicsClass 10 Mcq

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