2 and -2.
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The 4th root of 256 is 4
The real ones are -5 and +5.
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.
256.
the answer is 256:]