anonymous
  • anonymous
given a graph how do you identify intervals on which f''(x) < 0
Mathematics
  • Stacey Warren - Expert brainly.com
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schrodinger
  • schrodinger
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anonymous
  • anonymous
this is a second derivative.
anonymous
  • anonymous
yes
anonymous
  • anonymous
im looking at a graph however, i dont know how to calculate the intervals on which f''(x) <0

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anonymous
  • anonymous
is this an ad?
anonymous
  • anonymous
from sammi i think so. i cant afford to pay for help
anonymous
  • anonymous
im just trying to get help on my homework
anonymous
  • anonymous
we students may suffer from the budget tension.
anonymous
  • anonymous
yeah sammi but it cost
anonymous
  • anonymous
you can earn money by answering questions there too!
anonymous
  • anonymous
accordingly there are people who pay the money.
anonymous
  • anonymous
anyway ken could you help me figure this problem out?
anonymous
  • anonymous
you can do the first derivative , and then do the second.
anonymous
  • anonymous
for example, suppose f(x)=x^3+6x^2+4x+3 then f'(x)=3x^2+12x+4 f''(x)=6x+12
anonymous
  • anonymous
how to i find the first der. from the graph
anonymous
  • anonymous
If you have a graph of f, you look at the places on the graph where the concavity is negative (curve opens downward). This will be the places where the second derivative is negative.
anonymous
  • anonymous
back up a little bit, do you know the basic derivatives?
anonymous
  • anonymous
polpak is right, but it is just perceiving by eyes, not calculating
anonymous
  • anonymous
if i have numbers i can find der., but there is only letters
anonymous
  • anonymous
to see where the first derivative is negative you look to see where the slope of the tangent to the graph points downward as x moves positively..
anonymous
  • anonymous
it's the same.
anonymous
  • anonymous
im not understanding
anonymous
  • anonymous
f'(x) stands for the slope of the tangent line at (x,f(x)). f''(x) stands for the change of the slope.
anonymous
  • anonymous
I presume you have some graph of a function, and you need to identify where the second derivative of the function is less than 0
anonymous
  • anonymous
i do have a graph so where it is sloping below 0
anonymous
  • anonymous
Is the graph of f, or of f'' ?
anonymous
  • anonymous
suppose f(x)=ax^3+bx^2+cx+d then f'(x)=3ax^2+2bx+c then f''(x)=6ax+2b
anonymous
  • anonymous
f'(x)
anonymous
  • anonymous
If it's the graph of f' then you simply need to see where the tangent lines have negative slope to find where f'' is less than 0.
anonymous
  • anonymous
i don get ya.(><)
anonymous
  • anonymous
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