anonymous
  • anonymous
How many criticals in x^(4/5) (x-4)^2
Mathematics
katieb
  • katieb
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tkhunny
  • tkhunny
Have you considered the 1st Derivative?
anonymous
  • anonymous
i know the answer is 3..but dont know why
anonymous
  • anonymous
criticals are where the first derivative is 0 or does not exist within a given domain. I recognize this problem from the stewart textbook hah

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tkhunny
  • tkhunny
Well then, what do you get for the 1st Derivative?
anonymous
  • anonymous
if y=x^(4/5) (x-4)^2 what is dy/dx ? then set up dy/dx=0 solve for x=? thats your critical poits
anonymous
  • anonymous
A plot is attached. The red curve is the derivative of the blue.
1 Attachment

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