Answer:
[tex](2x+5)in[/tex]
Step-by-step explanation:
we know that
The perimeter of a square is equal to
[tex]P=4b[/tex]
where
b is the length side of the square
In this problem we have
[tex]P=(8x+20) in[/tex]
so
[tex]4b=(8x+20)[/tex]
solve for [tex]b[/tex]
Divided by [tex]4[/tex] both sides
[tex]4b/4=(8x+20)/4[/tex]
[tex]b=(2x+5)in[/tex]
