math

-21-(-21)=
would this be 0 or 42

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asked by deedee
  1. The answer to that question is 0.

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    posted by Shirley
  2. 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.

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    posted by Tyler
  3. thanks Tyler

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    posted by a boy

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