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A student claims that \(2\sqrt{2}\) is rational because 2 is a rational number. Which statement correctly explains the error?

Answer and explanation

Correct answer: Multiplying an irrational number by a non-zero rational number keeps the result irrational.

If \(2\sqrt{2}=r\) were rational, then \(\sqrt{2}=r/2\) would also be rational, a contradiction. A non-zero rational multiple of an irrational remains irrational. Exam tip: divide by the rational factor to test the claim.

Related tags

Number SystemsIrrational NumbersSquare Root 2Proof By ContradictionRational MultiplesProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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