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Which option gives the correct squared relation used in the proof of \(\sqrt{2}\)?

Answer and explanation

Correct answer: If \(\sqrt{2}=\frac{m}{n}\), then \(m^2=2n^2\)

Assume that \(\sqrt{2}=\frac{m}{n}\), where \(m\) and \(n\) are integers and \(n\ne0\). Squaring both sides gives \(2=\frac{m^2}{n^2}\). Multiplying by \(n^2\) gives \(m^2=2n^2\), so option A is correct. Option B, with \(3n^2\), is the corresponding relation for \(\sqrt{3}\), not for \(\sqrt{2}\). Exam tip: for a square-root fraction relation, square both sides first and then clear the denominator.

Related tags

Number SystemsIrrational NumbersSquare Root Of 2Proof By ContradictionAlgebraic RelationsProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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