7x 2 9 4 8 July 8, 2019 16 32 64 128 4 9 3 5x )( 7x 2 8 )= 0 4 7x 2 8x 9 7x 2 x 9 )= 4 8 x 2 2x 7 7x-2 9=4 8 7x4 9
