1.What happened when you had a negative plus a negative, (-a) + (-b)?

2.What happened when you had a positive plus a negative, a + (-b)?

3.What happened when you had a positive minus a negative, a - (-b)?


4 What happened when you had a negative minus a negative, (-a) - (-b)?

1 answer

if by "what happened?" you mean did it wind up positive or negative, then it depends on the absolute values of a and b.

If |a| > |b| then
a+b has the same sign as a
a-b has the same sign as a