Question

Sa se determine numarul elementelor multimii : A={x∈ Z /|x+1|≤2}

Answer 1

-2 ≤ | x+1| ≤ 2

-2 ≤ x+1 ≤ 2  |-1

-3 ≤ x ≤ 1    =>A={ -3,-2,-1,0,1}