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If \(x\) is an irrational number and \(r\) is a rational number, which of the following statements is always true?

Answer and explanation

Correct answer: \(x+r\) is irrational

\(x+r\) must always be irrational. If \(x+r\) were rational, then subtracting the rational number \(r\) would make \(x=(x+r)-r\) rational, contradicting the fact that \(x\) is irrational. Option C is not always true because if \(r=0\), then \(xr=0\), which is rational. Exam tip: Adding or subtracting a rational number from an irrational number always gives an irrational number.

Related tags

Real NumbersIrrational NumbersRational NumbersNumber PropertiesClass 9 MathematicsNumber SystemsMathematicsClass 9 Mcq

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