Posted by Shadow on Sunday, August 28, 2011 at 12:39am.
Could anyone explain to be what these term mean in math? I try googling them but can't find the answer. Thanks
1.Opposite of a Difference
2.Opposite of a Sum
3.Opposite of an Opposite

Math  MathMate, Sunday, August 28, 2011 at 9:19am
The opposite of a number is its additive inverse. I do not see the term opposite used very frequently in this sense in English, although this is the proper term in French (l'opposÃ©).
For example, the opposite (or additive inverse) of 4 is 4.
You can check the validity by adding the two numbers together. Any number added to its opposite should give zero.
Since 4+(4)=0, we can safely say that the opposite of 4 is 4.
With the definition above, you should be able to handle the question. Post if you need more information.