Solution - Simplifying square roots

Simplify :  sqrt(1215) 

Factor 1215 into its prime factors
           1215 = 3⁵ • 5 

To simplify a square root, we extract factors which are squares, i.e., factors that are raised to an even exponent.

Factors which will be extracted are :
           81 = 3⁴ 

Factors which will remain inside the root are :
           15 = 3 • 5 

To complete the simplification we take the squre root of the factors which are to be extracted. We do this by dividing their exponents by 2 :
           9 = 3² 

The simplified SQRT looks like this:
         9 • sqrt (15)  

Simplified Root :