The -8 comes into play by figuring out -8 * (3x*6x + 3x*8 - 4*6x - 4*8) which gives the answer to the second part.
You then add the first part to the second one to get your answer.
Simplify the following and collect the like terms:
5(x - 8) - 8(3x - 4)(6x + 8)
I know i have to do the foil thing for the last part but what do I do with the -8?
Cause from the first part you get:
5x - 40
Then I know I have to do the 3x * 6x then 3x * 8 then -4 * 6x and then -4 * 8.
Am I doing it wrong. Well I know I am but where does the -8 come into play.