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The square roots of -81 are ±9i where i is the imaginary square root of -1.
Square roots can be positive or negative. 9 x 9 = 81 -9 x -9 = 81 9 is the positive square root of 81.
The square root of -81 = 9 i9i
The square root of 81 is 9
The square root of 6561 is 81