Click an item in the list or group of pictures at the bottom of the problem and, holding the button down, drag it into the correct position in the answer box. Release your mouse button when the item is place. If you change your mind, drag the item to the trashcan. Click the trashcan to clear all your answers.
Factor this expression completely and then place the factors in the proper location on the grid. Note: Place factors alphabetically in the grid!

mn - 4m - 5n + 20