Use the formula a2 – b2 = (a + b)(a – b) to factor completely. What are the factors of 36x8 – 49? (9x4 – 1)(4x2 + 49) (36x4 – 7)(x2 + 7) (6x4 – 7)(6x4 + 7) (6x8 – 7)(6x + 7) A square corner of 16 square centimeters is removed from a square paper with an area of 9x2 square centimeters. A square. Most of the square is shaded blue. In the bottom right of the square is a smaller square, outlined in a dashed line, and not shaded. Which expression represents the area of the remaining paper shape in square centimeters? (x – 7)(x – 9) (3x – 2)(3x – 8) (3x – 4)(3x + 4) (9x – 1)(x + 16)