Area of the Square = Side x Side (sxs)
If youre going to use the Long Method, just substitute x to each options and whichever has the largest value, thats the answer.
A. (4.25)(4.25) = 18.06.. (ANSWER)
B. (3.2)(3.2) = 10.24
C. (3)(3) = 9
D. (2.45)(2.45) = 6.0025
But the easiest way or the shortcut in finding the answer to this:
Since its 3x+2, just find the largest number in the options, and thats it.
Since 3/4, which is equivalent to 0.75, is the largest value, it will make the largest area of a square.