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Verified answer
Bab Pertidaksamaan KuadratMatematika SMA Kelas X
x² + 4x - 45 ≥ 0
(x - 9) (x + 5) ≥ 0
x + 5 ≤ 0
x ≤ -5
x - 9 ≥ 0
x ≥ 9
HP = { x | x ≤ -5 atau x ≥ 9, x ∈ bilangan real }