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Which of the following numbers must be irrational?

Answer and explanation

Correct answer: \(2+\sqrt{3}\)

\(2+\sqrt{3}\) is irrational. If it were rational, subtracting the rational number 2 would make \(\sqrt{3}\) rational, which is impossible. Also, \(\sqrt{9}=3\), and terminating or recurring decimals are rational. Exam tip: adding a rational number to an irrational number gives an irrational result.

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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