SOLUTION: The link to my question is below: https://ibb.co/mRQtFdz 1. On what open interval or intervals (if any) does the derivative of the function graphed below have negative values?

Question 1165453: The link to my question is below:
https://ibb.co/mRQtFdz
1. On what open interval or intervals (if any) does the derivative of the function graphed below have negative values?
2. On what open interval or intervals (if any) does the derivative of the function graphed below have positive values?
Answer by ikleyn(52778) (Show Source): You can put this solution on YOUR website!
.


(1)  where the function is decreasing AND has a derivative, there the derivative is NEGATIVE.


(2)  where the function is increasing AND has a derivative, there the derivative is POSITIVE.


Useful hint:  in the corner point, the function HAS NO derivative.

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