ABCD is a square. If one side of the square measures 2x – 5 inches and the other side measures x + 8 inches, find x.
Square has all sides equal hence
2x-5=x+8
or 2x-x=8+5 (by subtracting x and adding 5 on both sides)
Thus x=13 inches.
Check: 2x13-5=8+13 or 26-5=21.