Christos
  • Christos
f(x) = (2x +1)^3 f'(x) = 6(2x + 1)^2 f''(x) = 48x + 24 I need to know when its concave up/down increasing /decreasing and the inflection points I am new to this kind of stuff
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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rulnick
  • rulnick
First derivative is nonnegative for all real x, so f is non-decreasing. Second derivative is everywhere matching the sign of x+1/2, so there is an inflection point at x=-1/2. The function is concave down on x<-1/2 and concave up on x>-1/2.
Christos
  • Christos
how did you find the -1/2
rulnick
  • rulnick
f''(x)=0 at x=-1/2

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Christos
  • Christos
Ok and something more are my derivative calculations correct? f(x) = (2x +1)^3 f'(x) = 6(2x + 1)^2
rulnick
  • rulnick
Yes, all were perfect!
Christos
  • Christos
so its not decreasing that means its always increasing? Kinda what's the interval?
Christos
  • Christos
(0,infinity) increasing?
rulnick
  • rulnick
non-decreasing means increasing or flat. it is flat at the inflection point, increasing everywhere else
rulnick
  • rulnick
so increasing on the entire real line except at -1/2, where it is flat (deriv=0)
Christos
  • Christos
here it asks me the open interval on which f is increasing what should I put? (-inf,-1/2)U(-1/2,int) ?
rulnick
  • rulnick
yes, very nicely done
Christos
  • Christos
and decreasing interval*
rulnick
  • rulnick
empty set
Christos
  • Christos
like I just say "it's not decreasing anywhere" ?
rulnick
  • rulnick
yes
Christos
  • Christos
Alright, thank you!
rulnick
  • rulnick
welcome

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