Identify its surd or not and justify 3 root 7 -Maths 9th

Identify its surd or not and justify 3 root 7 -Maths 9th
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Yes,it is surd because a surd needs to be of the form nth root of a (unable to type exactly)where n is a positive integer and a is positive rational number.3 root 7 can be written as square root of 63 .Hence it is surd...
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