Question

x+1(in modul)mai mic sau egal cu patr...care este solutia???

Answer 1

<=  :  mai mic sau egal
|x+1| <= 4
-4 <= x+1<= 4     | -1
-5 <= x <= 3
     deci x ∈ [-5;3]

Answer 2

$|x+1| \leq 4 \\ x+1 \leq 4 \\ x \leq 4-1 \\ x \leq 3 \\ x+1 \leq -4 \\ x \leq -4-1 \\ x \leq -5 \\ x \in [-5,3]$