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Anonymous
2561/4 = 4√256 = 4
CHECK : 4 x 4 x 4 x 4 = 256.
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Do you mean: x8 = 256 If so: x = 2 because 28 = 256
256 = 28
4 or -4 to the fourth power equal 256
256 = (16)2 256 = (2)8