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Which of the following statements is not always true?

Answer and explanation

Correct answer: The sum of two irrational numbers is irrational.

Statement A is not always true. For example, \(\sqrt{2}\) and \(-\sqrt{2}\) are both irrational, but their sum is \(0\), which is rational. Statement B is always true: if the sum of an irrational and a rational number were rational, subtracting the rational number would make the irrational number rational, which is impossible. Similarly, multiplying or dividing an irrational number by a non-zero rational number keeps it irrational. Exam tip: Never assume that the sum or difference of two irrational numbers must be irrational.

Related tags

Real NumbersIrrational NumbersRational NumbersNumber PropertiesConceptual McqNumber SystemsMathematicsClass 9 Mcq

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