256 = (16)2
256 = (2)8
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4 or -4 to the fourth power equal 256
No, 256 is not a composite number. It is a power of 2, specifically 2 to the power of 8 (2^8), and only has 2 factors (1 and 256), making it a prime number.
Do you mean: x8 = 256 If so: x = 2 because 28 = 256
256 = 28
256 = 28