1 7 9 4 July 8, 2019 16 32 64 128 1 7 9 4 5 1 7 9 4 5 6 1 7 9 4 3 7 1 9 4 2 3 5 1 7 9 ) 40 1 7 9 divided 4 5 1 7 x 9 4 1 2 7 9 4 √ 1 7 9 4 25 7 1 4 9 10 1 7 9 x 4 5 1 6 7 9 4 1 7 8 9 4 1 7 4 2x )=- 9 4x 7 1 9 2 4 5