OK. 28 = 2 x 2 x 2 x 2 x 2 x 2 x 2 x 2 = 256
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It is: 22 = 4
Raise a power to a power by multiplying the two exponents together; e.g. (x 2)3 is x6
2^8 = 256
2^8 is equal to 256.
The rule is that you multiply the exponents. So if I have 2 squared and I want to raise it to the third power, you multiply the 2x3=6. When you multiply powers you add the exponents. When you raise exponents to a power you multiply. This works for rational exponents which can be used to represent roots as well.