Positive nine, or plus eighteen.
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Change the sign to a positive. -12 12
Negative in English terms means "opposite." Multiplication can represent "of". So, negative times negative is the "opposite of the opposite." And the opposite of an opposite is the same, hence positive, because "same" is the opposite of "opposite" and positive is the opposite of negative. So if you put it into English words, it actually makes some sense. In essence, negative and negative "cancel out."
Negative 81.
The question is somewhat ambiguous since you do not define "opposite". If what you are asking is: is the negative of a negative sometimes negative, the answer is: No, never.
-9 - -9 = 0