5x 7 2x 3x 9 2 July 8, 2019 16 32 64 128 5x 7 2 3x 9 4 2x 5 3 5 5x 2 2x 7 (- 3x 2 6x 9 3x 2 )- 5x 7 2x 2 )+ 4x 9 (3x - 7) ^ 2 = (5x - 9) ^ 2
