Verified answer

D.......

√(-216) = √(-1 * 216) = i * √(6 * 36) = 6 * i * √6 ----> Answer D: 6i√6

(Just remember that when break apart numbers under the radical to their factors, you can pull out factors by putting their square root on the outside. For example: √(6 * 4) turns into 2 * √6)

Think of it as √216√-1

216/36=6

So √36√6√-1

So 6√6i

or D 6i√6

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