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Verified answer
{x<_ 2}karena 4 di pindah ruas ke kanan lalu di akar supaya duadrat di x hilang
4 - x² ≤ 0
-x² ≤ -4
x² ≥ 4
√x² ≥ √4
|x| ≥ 2
x ≥ 2 atau x ≤ -2
HP = {x | x ≤ -2 atau x ≥ 2 , x e R}