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If a student writes only (\sqrt{5}\approx2.236) to prove rationality or irrationality, why is this argument incomplete?

Answer and explanation

Correct answer: A finite decimal approximation is not a proof

Step 1: (2.236) is only an approximate value, not the full value. Step 2: To prove irrationality, we must assume rationality and show a contradiction. Step 3: In exams, do not write a decimal approximation in place of proof.

Related tags

Real-NumbersRoot5Decimal-ApproximationProof-QualityProof Of Irrationality Of √2√3√5Proof Of Irrationality Of 2 3 5Real NumbersMathematics

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