C(x) = (x^1/7)(x + 8)

Find the inflection points.
(x, y) =

(smaller x-value)
(x, y)=
(larger x-value)
(x, y)=

Please help! I'll award a medal! I am stuck on this for a long time :(

Question

C(x) = (x^1/7)(x + 8)

Find the inflection points.
(x, y)	 = 	

   

 (smaller x-value)
(x, y)= 	
 (larger x-value)
(x, y)= 

Please help! I'll award a medal! I am stuck on this for a long time :(

wach · Answer

I think I can help.

wach · Answer

So, how do we find inflection points? This is where concavity changes, and thus, we should look to the second derivative of the function. Derive the function twice, to start.

anonymous · Answer

|dw:1365291473708:dw|
This is what I got for the double prime. Maybe my problems come with this, because this is not an ordinary function! I should set it to zero and find those points, right?