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Which skipped step would make the proof of \(\sqrt{2}\) incomplete?

Answer and explanation

Correct answer: After proving \(x\) even, proving \(y\) even

In the standard proof, assume \(\sqrt{2}=x/y\), where \(x\) and \(y\) are coprime integers. From \(2y^2=x^2\), we first conclude that \(x\) is even. Substituting \(x=2k\) then shows that \(y\) is also even. Thus, both \(x\) and \(y\) have the common factor 2, contradicting the assumption that they are coprime. Showing only that \(x\) is even gives no contradiction. Exam tip: In a contradiction proof of irrationality, explicitly reach a violation of the coprime condition.

Related tags

Number SystemsIrrationality ProofSquare Root 2Contradiction MethodCoprime IntegersProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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