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Mathematics 8 Online
OpenStudy (anonymous):

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

zepdrix (zepdrix):

Hey Cherry :) Welcome to OpenStudy. Let's try the first option performed on some of the elements in our set. Addition: 1+1 = 2 1+(-1) = 0 Hmm we were able to `leave` the set {-1,1} by performing addition on two members of the set. So this set is `open` under addition. Not closed because 2 is not in {-1,1}, neither is 0.

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