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A student says that \\(\frac{\sqrt{18}}{\sqrt{2}}\\) is irrational because it is the quotient of two irrational numbers. Which evaluation is correct?

Answer and explanation

Correct answer: The student is incorrect because \\(\frac{\sqrt{18}}{\sqrt{2}}=\sqrt{9}=3\\), which is rational.

The student’s rule is false: a quotient of two irrational numbers need not be irrational. Here \\(\sqrt{18}/\sqrt2=\sqrt9=3\\), so the result is rational. Exam tip: combine square roots first, then simplify.

Related tags

Irrational NumbersRational NumbersSquare RootsMisconception AnalysisNumber SystemsClass 9 MathematicsMathematicsClass 9 Mcq

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