9514 1404 393
Answer:
(x -5) meters
Explanation:
We assume the area is supposed to be ...
A = s^2 = x^2 -10x +25
This is a perfect square trinomial, so can be factored as ...
A = s^2 = (x -5)^2
Then the side length can be represented by the expression ...
s = (x -5) . . . . meters