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A student says that since 5 is a rational number, \(5+\sqrt{3}\) must also be rational. Which statement correctly identifies the error in the argument?

Answer and explanation

Correct answer: If \(5+\sqrt{3}\) were rational, subtracting 5 would make \(\sqrt{3}\) rational, which is impossible.

Assume \(5+\sqrt{3}\) is rational. Subtracting the rational number 5 would then make \(\sqrt{3}\) rational, contradicting its irrationality. Exam tip: rational minus rational is always rational.

Related tags

Number SystemsIrrational NumbersSquare Root 3Proof By ContradictionRational NumbersProof Of Irrationality Of Square Root 2 And Square Root 3MathematicsClass 9 Mcq

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