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Reena says that the sum of two irrational numbers is always irrational. Which of the following examples correctly shows the error in her statement?

Answer and explanation

Correct answer: \(\sqrt{2}+(-\sqrt{2})=0\)

Both \(\sqrt{2}\) and \(-\sqrt{2}\) are irrational, but their sum is \(0\), which is rational. Hence the word “always” makes Reena’s claim false. Exam tip: disprove universal statements using one counterexample.

Related tags

Irrational NumbersRational NumbersCounterexampleNumber SystemsMisconception AnalysisMathematicsClass 9 Mcq

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