SOLUTION: Hi, Can the following be factorise'd further? 16abc + 24abc - 4ac 4a ( 4bc + 6b -c ) - Should I be factoring 4bc + 6b - c further ? 16ab - 16as - 24pt + 24ps 16a(b-

Hi, 
Can the following be factorise'd further? 
16abc + 24abc - 4ac  <-- I think that "c" in that second term is incorrect
 4a ( 4bc + 6b -c ) 
- Should I be factoring 4bc + 6b - c further ? 

No you can't factor it further.

16ab - 16as - 24pt + 24ps
 16a(b-s) - 24p(t-s) 
- Should I be factoring this further ? 

That is not factored at all. To be
factored there must be no plus or minus signs outside of
parentheses.  All you can do with 

16ab - 16as - 24pt + 24ps

is factor out an 8

8(2ab - 2as - 3pt + 3ps)

Edwin