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In which interval will the graph of f(x) = x3 + 4x2 – 4x – 16 be above the x-axis?

In which interval will the graph of f(x) = x3 + 4x2 – 4x – 16 be above the x-axis?
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In which interval will the graph of f(x) = x3 + 4x2 – 4x – 16 be above the x-axis?

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User Mrjrdnthms
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1 Answer

4 votes
When -2<x<-4 the values for y are positive, and then again for all values of x greater than 2.
answered
User Kylekeesling
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8.0k points
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