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OpenStudy (anonymous):
In which interval will the graph of f(x) = x3 + 4x2 – 4x – 16 be above the x-axis?Select one of the options below as your answer: 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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OpenStudy (anonymous):
does it help to know that \[ x^3 + 4x^2 – 4x – 16=(x+4)(x+2)(x-2)\] so your being asked to solve \[(x+4)(x+2)(x-2)>0\]
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