23 2 x 1 )= 5x 3 July 8, 2019 16 32 64 128 2 x 1 3 2x 2 )= 23 5x 2 x 1 3 2x 2 )= 23 5x by factorisation 23+1 5 23+- 5 23 5(x + 1 2) =12 5x
