Suppose the derivative of a function $f$ is below. On what interval is $f$ increasing?
$$ f'(x) = (x+1)^4(x-5)^3(x-7)^6 $$
calculusderivatives
asked 2011-11-28
user id:20219
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Where does the second derivative come in? – 2011-11-28
1
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