A 3 −27b 3 July 8, 2019 16 32 64 128 A 3 27b 3 Factorise a 3 27b 3 A 3 27b 3 8c 3 18abc A 3b a 3 27b 3 A 6 28a 3b 3 27b 6 A 3 27b 3 9ab a 3b