fatcorise this
1. 3a(p-2q)+2b(2q-p)
3a(p-2q) +2b(2q-p)
= 3a(p-2q) -2b(-2q+p)
= 3a(p-2q) -2b(p-2q)
= (3a-2b)(p-2q)
If you need me to explain better then ask me to :)
(Try and tell me which bit you do not understand though)
