15 3 x 2 4 July 8, 2019 16 32 64 128 15 =- 3 2 x )- 4x 15 3 2 4 x 5 15 3x 2 4x 15 x 6 3 4 2 15 1 2 x 3 4 15 4 7 x 3 2 7 6 1 7 X 3 4x 2 2x 15 15 4 2 7 3 x 5 15 3 x 4 )= 2x 2 3 x 3x 2 4x 15 x 3 15 1 x 3 2 4 5 15 3 4 x 2 5 8 15 3 8 x 2 4 24 15 3 x 4 2 15 3 3x 4 )= 2 4 4x