Set notation and roster notation of sets.

Mathematics
Tutor: None Selected Time limit: 1 Day

Use proper set notation to rewrite the set with roster notation (ex. {1,2,3,4,5}). The problem is {x|x^2 = 9} (x squared is 9, so x would be 3 but I'm not sure how to write that out.)

Thanks in advance!

Sep 3rd, 2015

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Problem: {x| x^2=9}

Note, there are only two numbers that make this true.

(-3)^2=9

(3)^2=9

Therefore, there are only two elements, and the roster notation would be {-3,3}


To give another example, Let's say we were working with the natural numbers.

The natural numbers are any positive integer (meaning any positive whole number, excluding 0). Since we consider 0 to be both positive and negative.

The roster notiation would be {1,2,3,4,5,...}


Please let me know if you need any clarification. I'm always happy to answer your questions. Leave a positive review if you are happy!
Sep 3rd, 2015

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