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A student claims that \(1+\sqrt{2}\) is rational because 1 is a rational number. Which argument correctly refutes the claim?

Answer and explanation

Correct answer: If \(1+\sqrt{2}\) were rational, subtracting 1 would make \(\sqrt{2}\) rational, which is impossible.

Assume \(1+\sqrt{2}\) is rational. Rational numbers are closed under subtraction, so \((1+\sqrt{2})-1=\sqrt{2}\) would be rational. This contradicts the known irrationality of \(\sqrt{2}\). Exam tip: adding or subtracting a rational number cannot make an irrational number rational.

Related tags

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

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