Hey there! :-)
The Distributive Property states the following:
a(b+c)=ab+ac
Where we distribute a by multiplying it times b and c
Now, let's simplify our expression:
-2(4+m)
-8-2m
or
-2m-8
Hence, the final answer is

Hope everything is clear.
Let me know if you have any other queries; if so, please comment.
#LearningDoesn'tEnd
P.S. Sorry for the late response!