What to donominator to be obtained after rationalising the denominator of 4 by 7 underroot 5 - 5 underroot 7
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we have ,
4/7√5-5√7
on rationalising we get,,,
4(7√5-5√7)/49•5-25•7
4/7√5-5√7
on rationalising we get,,,
4(7√5-5√7)/49•5-25•7
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