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Question
Write the simplest form of rationalising factor for the given surd.
`3 sqrt 72`
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Solution
Since, `3 sqrt 72 =3 sqrt(36 xx 2) =3 xx 6sqrt2=18sqrt 2`
`18sqrt2 xx sqrt2 = 18 xx 2 = 36` is a rational number.
So, `sqrt 2` is the simplest form of rationalising factor.
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