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d.
4 - 2x ≤ 0 × (x + 2)
4 - 2x ≤ 0
-2x ≤ 0 - 4
-2x ≤ -4
x ≥ 2
2.
a.
2x - 4 ≤ 1 (x - 1)
2x - 4≤ x - 1
2x - x ≤ -1 + 4
x ≤ 3
b.
(x + 5)(x - 1) < (x + 1)(x + 3)
x² - x + 5x - 5 < x² + 3x + x + 3
x² + 4x - 5 < x² + 4x + 3
x² - x² + 4x - 4x < 3 - 5
0 < -2
jadi, tidak ada penyelesaiannya