We have been given that Ben has a square garden that has sides measuring X feet, Ben wants to increase every side of his garden by 11 feet in order to plant more vegetables. So each side of garden would be [tex]X+11[/tex].
We are also told that after Ben increased his garden it will have a perimeter of 104 feet.
We know that perimeter of square is 4 times the side length. So perimeter of garden after enlargement would be [tex]4(X+11)[/tex].
Now we will equate perimeter of new garden with 104 as:
[tex]4(X+11)=104[/tex]
Therefore, the equation [tex]4(X+11)=104[/tex] can be used to solve for X.
[tex]\frac{4(X+11)}{4}=\frac{104}{4}[/tex]
[tex]X+11=26[/tex]
[tex]X+11-11=26-11[/tex]
[tex]X=15[/tex]
Therefore, the value of X is 15 feet.