It does not come out as a whole number but it's 4.242640678
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If "a" is positive, it will have two fourth roots, one will be positive and one will be negative it will have one fifth root, which will be positive. If "a" is negative, it will have one fourth root, which will be negative. it will have one fifth root, which will be negative.
2 and -2.
The real ones are -5 and +5.
The 4th root of 256 is 4
324