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Question
Write the simplest form of rationalising factor for the given surd.
`sqrt 27`
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Solution
Since , `sqrt 27 = sqrt (9 xx 3) = 3 sqrt 3`
`therefore 3sqrt3 xx sqrt3 = 3 xx 3 = 9` is a rational number.
So, `sqrt 3` is the simplest form of rationalising factor.
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