Is it simply a root or something more? All roots are not surds, ONLY SOME ARE.Check out the links below to learn more.
http://www.bbc.co.uk/schools/gcsebitesize/maths/number/surdsrev1.shtml
http://www.mathsisfun.com/surds.html
http://www.mathcentre.ac.uk/resources/uploaded/mc-ty-surds-2009-1.pdf
Of course there are numerous text which can answer this simple question, either way Happy Reading!
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