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x - 2 = 2^y
x = 2^y + 2
2. x² - 4x + 3 = 0
(x - 1)(x - 3) = 0
x = 1 atau x = 3
3. 2 + x - x² ≥ 0
x² - x - 2 ≤ 0
(x + 1)(x - 2) ≤ 0
- 1 ≤ x ≤ 2
3x - x² ≤ 0
x(3 - x) ≤ 0
0 ≤ x ≤ 3