You cant simplify the square root of 15
the way to simplify is to find factors of the number of which at least one can be square rooted and simplified.
eg. (sqr.rt.)12 = (sqr.rt.)4 x (sqr.rt.)3 = 2(sqr.rt)3
or said as " Two root Three"
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As a simplified surd, it is 5*sqrt(15)
15 square root sign 5
It is approximately 47.434164902525689979983403166491. But, it can be simplified to 15√10.
It is: 3 times the square root of 15 or about 11.619 rounded to 3 decimal places
The square root of 212 simplified is: 14.6