1 3 6x 4 July 8, 2019 16 32 64 128 1 3 6x 45 1 3 * 6x (- 4 )(- 9 1 6x 3 4x 2 1 6x 3 4x 1 6x 3 4 1 2x 1 6x 3 4 1 3x 1 6x 4 3 x 6x 3 4x 1 6 2 1 3 6x 4 1 3 3x 1 6x 4y 3 1 3 6x 1 7x 40 28 4x 3 6x 1 x 6x 3 x 1 )= 4 5x 6x 3 2y 1 4x y 1 3 12 6x )= 4 2x