15 square root sign 5
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3 times the square root of 5
It is 2*sqrt(5).
About 6.71 meters.
Find the prime factorization of the number left underneath the root, and if there are now repeated numbers, then the square root has been simplified completely. For example for 12√(30), the prime factorization of 30 is 2*3*5. There are no repeated numbers, so 12√(30) has been simplified completely. For 9√(50), the prime factorization of 50 is 2*5*5. A number is repeated (there are two 5's) so 9√(50) has not been simplified completely. (It can be simplified to 45√(2).)
6^2 is 367^2 is 49so, the square root of 45 is between these two but is an irrational number close to6.708203932