sqrt(216)
factor under the radical by dividing by squared numbers. 6 works.
sqrt(62 * 6)
bring out 6 from under radical
6sqrt(6)
===========simplified
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A radical is an exponent, stupid.
6 radical 6
2 radical(8) = 4 radical(2)
radical 36 = square root 36 = 6
radical 15 cannot be simplified.