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A student claims that the sum of two irrational numbers is always irrational. Which of the following examples disproves this statement?

Answer and explanation

Correct answer: \(\sqrt{5}+(-\sqrt{5})\)

Both \(\sqrt{5}\) and \(-\sqrt{5}\) are irrational, but \(\sqrt{5}+(-\sqrt{5})=0\), and \(0\) is rational. Therefore, this example disproves the student's claim. In the other options, the sums remain irrational. Exam tip: The sum of two irrational numbers is not always irrational; opposite irrational numbers can add to zero.

Related tags

Real NumbersIrrational NumbersRational NumbersNumber SystemsStatement EvaluationMathematicsClass 9 Mcq

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