-21-(-21)=
would this be 0 or 42
3 answers
The answer to that question is 0.
It's zero because negative numbers are the opposite of non-negative numbers.
For example, you can rewrite ideas you are already familiar with using negative numbers:
1 - 1 = 1 + -1 = 0
-1 - 1 = -1 + -1 = -2
-1 - -1 = -1 + --1 = -1 + 1 = 0
Two negative signs on the same number make a positive.
For example, you can rewrite ideas you are already familiar with using negative numbers:
1 - 1 = 1 + -1 = 0
-1 - 1 = -1 + -1 = -2
-1 - -1 = -1 + --1 = -1 + 1 = 0
Two negative signs on the same number make a positive.
thanks Tyler