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You can. but it is preferred if you do not. This is because it is generally easier to estimate the value with a radical in the numerator than in the denominator.

For example, given that sqrt(2) = 1.414, approx estimating the value of 3/sqrt(2) is not easy since it requires division by 2.414 However, 3/sqrt(2) = 3*sqrt(2)/2 = 3*1.414/2 = 3*0.707 = 2.121 - a calculation that any half-way competent pupil an carry out in their head.

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Q: Why can you not have a radical in the denominator?
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