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Problem

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Textbook Expert
Textbook ExpertVerified Tutor
28 Dec 2021

Given information

Given function is 

Step-by-step explanation

Step 1.
Using a second derivative of function we can conclude if function is concave upward or downward. Let's find the second derivative of the function
 
 
 
Find derivative of obtained function. That will be second derivative of function $f$.
 
   
Recall that the function is concave downward if
 
 
 
 
Solving quadratic inequality we get the interval  
 
 

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