The 4th root of 3,888 is ± 7.896444
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the 4th root of 80 equals 2.9907
The 4th root of 16 is 2
Restricting to real roots, 4th root of 10000 = +/- 10 4th root of 81 = +/- 3 So 4th root of 10 000 over 81 = +/- 10/3 or +/- 3.33....
4th root is same as square root of square root: sqrt(256) = 16, and sqrt(16) = 4