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 ->  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


   

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
Found 3 solutions by fractalier, JimMarshall, CoolRekt:
Answer by fractalier(6550) About Me  (Show Source):
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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.

Answer by JimMarshall(82) About Me  (Show Source):
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Ans is 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.

Answer by CoolRekt(53) About Me  (Show Source):
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Choice B is correct. It's like changing something to a negative. A is wrong since it just changes the exponent, not the base. C is wrong since it just swaps the numbers backwards, not making it a negative. D is wrong because 2 cannot be opposites of a fraction (especially if it isn't a negative).
CoolRekt