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(x + 2)(x + 2) < 0
(x + 2)² < 0
hp {x < -2}
b. 2x² + 6x + 4 ≥ 0 (:2)
x² + 3x + 2 ≥ 0
(x + 2)(x + 1) ≥ 0
x = -2 ; x = -1
hp {x ≥ -1 atau x ≤ = -2}