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If \(x\) is an irrational number, which of the following expressions is not necessarily irrational?

Answer and explanation

Correct answer: \(x^2\)

\(x^2\) need not be irrational. For example, \(x=\sqrt{2}\) is irrational, but \(x^2=2\) is rational. Adding a rational number to, or multiplying/dividing an irrational number by a non-zero rational, keeps it irrational. Exam tip: test such claims using \(\sqrt{2}\).

Related tags

Irrational NumbersNumber SystemsProperties Of IrrationalsRational NumbersClass 9 MathematicsMathematicsClass 9 Mcq

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