The perimeter of a square with a side of x+3
[1] x^2+9
[2] x^2+6x+9
[3] 4x+12
[4] 4x+3
perimeter of a square with side s = 4s
perimeter of a square with side x + 3 = 4(x + 3) = 4x + 12
thank you!
+-9 
