To solve this problem, the first thing you need to do is distribute the 4 and the -8 to the numbers inside the parentheses.
4(2m+2) - 8(3m + 6)
8m + 8 - 8(3m + 6) : when distributing, keep in mind the negative sign in front of the 8.
8m + 8 - 24m - 48
Now, group and add like terms.
8m - 24m +8 - 48
-16m - 40 is your answer