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4(2x+3) [there's 4 equal sides] 4(2x)+4(3) 8x+12
s^2
It is the square of the original number. If the original number represents a length, then the square of the original number represents an area of a square with side equal to the original number.
Length of Side*Length of Side (in square units).
The square root of what? If you take the square root of the area, the answer will be the length of the side. If the area is, for example, in square meters, the length of a side will be in meters.