3x² - 12 > 0
3(x² - 4) > 0
3(x - 2)(x + 2) > 0
x ∈ (-∞,-2) v (2,∞)
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3x² - 12 > 0
3(x² - 4) > 0
3(x - 2)(x + 2) > 0
x ∈ (-∞,-2) v (2,∞)