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Verified answer
Bab Barisan dan DeretMatematika SMA Kelas X
|x + 2| ≥ |x - 1|
(x + 2)² ≥ (x - 1)²
(x + 2)² - (x - 1)² ≥ 0
(x + 2 + x - 1) (x + 2 - x + 1) ≥ 0
(2x + 1) . 3 ≥ 0
2x + 1 ≥ 0
2x ≥ -1
x ≥ -1/2
HP = { x | x ≥ -1/2, x ∈ bilangan real }