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In a proof by contradiction, a student assumes \(\sqrt{3}=p/q\), where \(p\) and \(q\) are coprime. After obtaining \(p^2=3q^2\), which statement correctly justifies the conclusion \(3\mid p\)?

Answer and explanation

Correct answer: If the prime number 3 divides \(p^2\), then it also divides \(p\).

From \(p^2=3q^2\), we get \(3\mid p^2\). Since 3 is prime, the prime-factor property gives \(3\mid p\). Putting \(p=3k\) then shows \(3\mid q\), contradicting coprimality. In exams, state the prime-factor property explicitly.

Related tags

Number SystemsIrrational NumbersProof By ContradictionSquare Root 3Prime Factor PropertyClass 9 MathematicsProof Of Irrationality Of Square Root 2 And Square Root 3Mathematics

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