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Which of the following is the correct form of \(\frac{3}{\sqrt{2}}\) after rationalising the denominator?

Answer and explanation

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

To rationalise the denominator, multiply the numerator and denominator by \(\sqrt{2}\): \(\frac{3}{\sqrt{2}}\times\frac{\sqrt{2}}{\sqrt{2}}=\frac{3\sqrt{2}}{2}\). Therefore, option B is correct. In option A, the factor \(\sqrt{2}\) is incorrectly omitted from the numerator. Exam tip: When the denominator contains \(\sqrt{a}\), multiply both numerator and denominator by \(\sqrt{a}\).

Related tags

Real NumbersRationalisation Of DenominatorIrrational NumbersNumber SystemsMathematicsClass 9 Mcq

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