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

Answer and explanation

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

In option B, \(2-\sqrt{2}\) is irrational because subtracting an irrational number from a rational number gives an irrational result. However, \(\sqrt{2}+(2-\sqrt{2})=2\), which is rational. Thus, this example disproves the student's claim. Options A, C and D are irrational. Exam tip: The sum of two irrational numbers may be either rational or irrational.

Related tags

Real NumbersIrrational NumbersRational NumbersNumber SystemsMisconceptionMathematicsClass 9 Mcq

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