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Suppose the derivative of a function $f$ is below. On what interval is $f$ increasing?

$$ f'(x) = (x+1)^4(x-5)^3(x-7)^6 $$

  • 2
    Where does the second derivative come in?2011-11-28
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    Why use the Second Derivative Test (http://en.wikipedia.org/wiki/Second_derivative_test)? The hint/answer provided below should answer your questions.2011-11-28

2 Answers 2