pliss bantu donggg!!

NiLai MutLak
•
|3 - 2x| ≤ 4
-4 ≤ 3 - 2x ≤ 4
-4 - 3 ≤ -2x ≤ 4 - 3
-7 ≤ -2x ≤ 1
-7/-2 ≥ x ≥ 1/-2
-1/2 ≤ x ≤ 7/2

•
|3x + 2| ≤ 5
-5 ≤ 3x + 2 ≤ 5
-5 - 2 ≤ 3x ≤ 5 - 2
-7/3 ≤ x ≤ 3/3
-7/3 ≤ x ≤ 1

•
|x + 5| ≤ |1 - 9x|
(x + 5)² - (1 - 9x)² ≤ 0
((x + 5) + (1 - 9x))((x + 5) - (1 - 9x)) ≤ 0
(6 - 8x)(10x + 4) ≤ 0
x ≤ -4/10 atau x ≥ 6/8
x ≤ -2/5 atau x ≥ 3/4