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X2-X-6 = -6
X2-X-6+6 = 0
X2-X = 0, jadi himpunan penyelesaiannya adalah X2-X
X²-X-6 ≥ -6
X²-X-6+6 ≥ 0
X²-X ≥ 0
x(x-1) ≥ 0
x₁ = 0 , x₂ = 1
HP= {x|x≤0 atau x≥1}