2i, which isn't real, but only possible answer.
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The real fourth root of 0.0001 are -0.1 and +0.1
The 4th root of 16 is 2
Take your number to the exponent (1/4). Example: Fourth root of 16. 16^ (1/4) = 2
± 0.1
4th root is same as square root of square root: sqrt(256) = 16, and sqrt(16) = 4