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The solution to the problem 2x2 is 4 (the result of multiplication).
It means that you increase something's height by x2 and its width by x2 (and depth by x2 when you have a 3D object)
It depends on the capability of your computer. In this web site, there are the text controls right above where I am typing my answer. I will type r2, then select the '2' by itself, then click the x2 above the text box. Those two symbols, x2 and x2 are for subscript and superscript. So, when done, r-squared is correctly displayed like this: r2.
Each element is the mean of the corresponding elements. Thus, the mean of (x1, y1) and ( x2, y2) is [( x1 + x2)/2, (y1 + y2)/2]
If you mean: x2+3x+2 then it is (x+1)(x+2) when factored