It means 2*2*2*2=8.
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192 = 361
Exponents are usually written like this: 3^2 means "3 to the second power". Square roots are often written with sqrt in front, such as as sqrt(5)
It means that the exponent is 2.
This is one of the laws of exponents, which states that xa * xb = x(a+b) The base is x, and the two powers (or exponents) are a and b.
x-n = 1 / xn