In algebra, opposites are two numbers on opposite sides of zero. so 3 and -3 are opposite numbers because they are both 3 spaces away from 0.
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A friend used this phrase. I think she meant Boolean Algebra.
The specific word "algebra" first appears in Latin, specifically medieval Latin. It's derived from an Arabic term "al jebr", though, if that's what you meant.
Algebra as we know it today is generally credited to work done by the 9th century Persian mathematician al-Khowarizmi. The original Arabic al-jabr meant "completion" or "balancing".
The answer depends on where opposite! Even if you could spell correctly, the answer would depend on whether you meant the additive opposite or the multiplicative opposite.
Accident and Emergency. The magic word "plus" meant that this question ended up on the Algebra board!