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 #1
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By the way, it's supposed to be unit of intervals, not unit of i!

 Jun 5, 2023
 #2
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If 2+z is not in the interval (−1,1], then 2+z≤−1 or 2+z≥1. This gives us the two cases z≤−3 and z≥1. Similarly, if 2−z is not in the interval (−1,1], then 2−z≤−1 or 2−z≥1. This gives us the two cases z≥3 and z≤−1. Therefore, we are looking for all z such that z≤−3 or z≥3. This gives us the set (−∞,-3]∪[3,∞)​.

 Jun 5, 2023

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