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If (p=2r) and (p^2=2q^2), which conclusion follows next?

Answer and explanation

Correct answer: \(q^2=2r^2\)

Given \(p=2r\), substitute it into \(p^2=2q^2\): \((2r)^2=2q^2\), so \(4r^2=2q^2\). Dividing both sides by 2 gives \(q^2=2r^2\). The result \(q^2=4r^2\) would come from incorrect division. Exam tip: after substitution, remember that \((2r)^2=4r^2\).

Related tags

Number SystemsIrrationality ProofSquare Root 2SubstitutionAlgebraic ManipulationProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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