Answer:
(x+5) meters long
Step-by-step explanation:
x^2 + 10x+25
We recognize that this is a perfect square trinomial
a^2 + 2ab+b^2 = (a+b)^2
x^2+2*5*x+5^2 = (x+5)^2
Since this is a square
A = s^2 where s is the side length
(x+5) ^2 =s^2
Each side is (x+5)
