tolong dong kerjakan nomor 9

jawab

3 > |2x + 1| < 11

(i) 3 > |2x + 1|  
3 > 2x + 1 > - 3
3 - 1 > 2x > -3 - 1
2 > 2x > - 4
1 > x > - 2
- 2 < x < 1

(ii) | 2x + 1|  < 11 
-11 < 2x + 1 < 11
-11 - 1 < 2x  < 11 - 1
-12 < 2x < 10
-6 < x < 5

HP  irisan (i) dan  ii)
HP - 2 < x < 1