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A student claims that \(2+\sqrt{3}\) is a rational number. Which argument correctly disproves the claim?

Answer and explanation

Correct answer: If \(2+\sqrt{3}\) were rational, subtracting 2 would make \(\sqrt{3}\) rational, which is impossible.

Assume \(2+\sqrt{3}\) is rational. Subtracting 2 then makes \(\sqrt{3}\) rational, contradicting its irrationality. Tip: adding a rational number cannot make an irrational number rational.

Related tags

Irrational NumbersSquare Root 3Proof By ContradictionNumber SystemsProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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