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Let p and q be rational numbers with q ≠ 0. If a student claims that \(\frac{p+\sqrt{2}}{q}\) is rational, which conclusion would follow from the claim?

Answer and explanation

Correct answer: \(\sqrt{2}\) would be rational

If \(\frac{p+\sqrt{2}}{q}=r\) is rational, then \(\sqrt{2}=qr-p\). Since p, q and r are rational, the right side is rational, contradicting the irrationality of \(\sqrt{2}\). Exam tip: use closure of rational numbers under multiplication and subtraction.

Related tags

Irrational NumbersRational NumbersProof By ContradictionNumber SystemsClass 9 MathematicsMathematicsClass 9 Mcq

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