R 4 3r 2 1 July 8, 2019 16 32 64 128 3r r 1 )+ 2 3r 4 )= 18 4 r 14 )= − 2 3r 2 2 3r 4 r 1 )= 11 2 3r 4 )- 3 r 1 R 4 1 3 2 4 r 4r^2 =