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Treat it like a positive and add an i.

Explanation: The square root of negative nine is equal to the square root of nine times negative one is equal to the square root of nine times the square root of negative one. The square root of negative one represented by an italic lower case i. The square root of negative nine is 3i.

√-9 = √9 * -1 = √9 * √-1 = 3i

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Q: How do you do square roots with negatives?
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