|x+1|= { −x−1 gdy x+1<0 x<−1
{ x+1 gdy x+1 ≥0 x≥−1
4(−x−1)≤ 13 4(x+1) ≤ 13
−4x−4 ≤13 4x+4 ≤ 13
−4x ≤17 4x ≤9
x ≥−174 x≤9/4
| 1 | 1 | |||
x ≥−4 | x ≤2 | |||
| 4 | 4 |
| 1 | 1 | |||
x∊<−4 | ;2 | > | ||
| 4 | 4 |