5x 2 4x 9 8 July 8, 2019 16 32 64 128 5x 2 9 4x 8 4 X 8 2 4x 9 5x 2x 2 5x 9 )+( 4x 2 7x 8 5 2 (- 5x 8 )= 9 4x 9 8 5x 2 1 4x 12