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Gunakan rumus
(3x+5+8).(3x+5-8) = 0
(3x+13) (3x-3) = 0
3x +3 = 0 V 3x - 3 = 0
3x = -3 3x = 3
x = -1 x = 1
2. l 3x - 5 l < 4
- 4 < 3x - 5 < 4
-------------------------- semua ditambahkan 5
- 4 + 5 < 3x -5 + 5 < 4 + 5
1 < 3x < 9
-------------------------- semua dibagi 3
1/3 < x < 3