8 - (-21) = 8 + 21 = 29
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It is: 8 - -21 = 29
21 minus -5 is 26.
the answer of negative 4 minus positive 21 is positive 25 because you leave the negative 4 as is, change the minus to a plus, and change positive 21 to negative 21. (Leave Change Change)
-8 - (-13) = - 8 + 13 = +5 ( minus a minus is a plus)
8 minus negative three or 8--3 equal positive 11. The double negative converts the minus sign into a plus sign and the negative into a positive.