Question

Urgeeent! B={x€N | -1< sau egal cu 2 -x< sau egal cu 5

Answer 1

- 1 ≤ 2-x ≤ 5        - 3 ≤ - x ≤ 3      3 ≥ x ≥ - 3    x ∈ {0,1,2}

Answer 2

-1≤2-x≤5
-1≤2-x =>-3≤-x =>3≥x=>x∈(-∞,3]
2-x≤5 =>-x≤3 =>x≥-3=>x∈[-3,+∞)
(-∞,3]∩[-3,+∞)={0,1,2}