Question 25961
This is a simple case:
-(a+b) is the same as -1*(a+b), just that we omit the one beacuse it is a mathematical notation.

Now we use the distributive property:
-1*a+(-1)*b
it becomes:
-a-b

-(a+b)=-a-b
example:
8*(2+3)=8*(2)+8*(3) DISTRIBUTIBE PROPERTY