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Suppose a student writes \(\sqrt{3}=\frac{p}{q}\), where \(p\) and \(q\) are coprime, while proving that \(\sqrt{3}\) is irrational. From \(p^2=3q^2\), which conclusion about \(p\) is correct?

Answer and explanation

Correct answer: Since 3 is prime and \(3\mid p^2\), therefore \(3\mid p\).

From \(p^2=3q^2\), we get \(3\mid p^2\). Since 3 is prime, divisibility of a square by 3 implies \(3\mid p\). Substituting \(p=3k\) then makes \(q\) divisible by 3 too, contradicting coprimality. Exam tip: use the prime-divides-square rule in such proofs.

Related tags

Number SystemsIrrational NumbersSquare Root 3Proof By ContradictionPrime DivisibilityClass 9 MathematicsProof Of Irrationality Of Square Root 2 And Square Root 3Mathematics

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