It is: 22 = 4
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Raise a power to a power by multiplying the two exponents together; e.g. (x 2)3 is x6
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.
multiply it by itself six times for example 2 to the 6th power = 2x2x2x2x2x2 = 64
x25 x10
the cube root of 8 is 2 because, 2 raise to the power of 3=2x2x2=8