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Kitten_is_back

  • one year ago

For which operations is the set {–1, 1} closed? Choose all answers that are correct. A. addition B. subtraction C. multiplication D. division

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  1. anonymous
    • one year ago
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    If I remember what these questions are about, C, and D are correct. \[-1 \times 1 = -1 \] \[\dfrac{-1}{1} = -1\] Negative one is part of the set. Ergo, closed.

  2. Kitten_is_back
    • one year ago
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    so times and subtraction?

  3. anonymous
    • one year ago
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    Subtraction does not work, since you get 0, and that is not part of the set.

  4. Kitten_is_back
    • one year ago
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    okay so its a c or d we know its c what about addition?

  5. anonymous
    • one year ago
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    Actually we know it is both, C, and D. Any my bad, with addition we get zero, subtraction gives us -2, which is also not in the set.

  6. Kitten_is_back
    • one year ago
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    okay so its just c d?

  7. anonymous
    • one year ago
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    Addition: -1 + 1 = 0. Subtraction: -1 - 1 = -2

  8. anonymous
    • one year ago
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    Yes.

  9. Kitten_is_back
    • one year ago
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    so b c d?

  10. anonymous
    • one year ago
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    B gives -2, and the set is only {-1, 1} so no.

  11. Kitten_is_back
    • one year ago
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    okay M<# thans

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