Rhett decides to build a square room for his movie and music collection. If the area of the room is 9x^2 āˆ’ 6x + 1 square feet, what is the length of one side of the room?

(3x + 1) feet
(9x āˆ’ 1) feet
(3x āˆ’ 1) feet
(9x + 1) feet