The area of a square plot is $9x^{2} + 12x + 4$ sq m. Its side length is

The area of a square plot is $9x^{2} + 12x + 4$ sq m. Its side length is
  1. $(3x + 2)$ m
  2. $(3x - 2)$ m
  3. $(3x + 4)$ m
  4. $(9x + 2)$ m

Solution

$9x^{2}+12x+4 = (3x+2)^{2}$. So side $= 3x+2$.

Asked in: IMO

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