A square piece of paper has an area of x2 square units. A rectangular strip with a width of 2 units and a length of x units is cut off of the square piece of paper. The remaining piece of paper has an area of 120 square units.

The square has area x², and the cut-off strip has area 2x because its width is 2 and its length is x. Subtracting the strip’s area leaves x² − 2x, which equals the remaining area of 120. Rearranging gives x² − 2x − 120 = 0, which is choice A.

AI-written and checked against the verified answer.