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OpenStudy (stgudv18):
In which interval will the graph of f(x) = x3 + 4x2 – 4x – 16 be above the x-axis? a. (-2, 2) È (4, ∞) b. (-4, -2) È (2, ∞) c. (-∞, -2) È (-2, 9) d. (-4, -2) È (2, 4)
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