SOLUTION: Which of of numbers are opposites? A) x and x^-1 B) 2 and -2 C)12 and 21 D) 2 and 1/2

Algebra ->  Algebra  -> Roman-numerals -> SOLUTION: Which of of numbers are opposites? A) x and x^-1 B) 2 and -2 C)12 and 21 D) 2 and 1/2      Log On

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Question 42221: Which of of numbers are opposites?
A) x and x^-1
B) 2 and -2
C)12 and 21
D) 2 and 1/2
Answer by fractalier(2101) About Me  (Show Source):
You can put this solution on YOUR website!
Choice B.
2 and -2 are additive inverses, and thus opposites.
It should be noted that choice D are a pair of multiplicative inverses and could also be construed as opposites in a multiplicative sense.