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. -2 > 2x-1 > 2
-2+1 > 2x > 2 +1
-1/2 > x > 3/2
.
b)
|x/3 - 2| ≤ 6
- 6 ≤ x/3 - 2 ≤ 6
-4 ≤ x/3 ≤ 8
-12 ≤ x ≤ 24
c)
(x-2)² < 3² (x-7)²
x² - 4x + 4 < 9 (x² -14x + 49)
x² - 9x²- 4x+14x + 4 - 49 < 0
-8x² + 10x - 40 < 0
x² - 4x +5 > 0
(x-5)(x+4) > 0
x > 5 atau x < 4
4 > x > 5
d)
| 3x - 1 |² < 2² | x + 6 |²
9x² - 6x + 1 < 4(x²+12x+36)
9x² - 4x² -6x-48x + 1 - 144 < 0
5x² - 54x - 143 < 0
(5x-11)(x+13)< 0
x < 11/5 atau x > -13