Question

given a graph how do you identify intervals on which f''(x) < 0

Answer 1

this is a second derivative.

Answer 2

yes

Answer 3

im looking at a graph however, i dont know how to calculate the intervals on which f''(x) <0

Answer 4

is this an ad?

Answer 5

from sammi i think so. i cant afford to pay for help

Answer 6

im just trying to get help on my homework

Answer 7

we students may suffer from the budget tension.

Answer 8

yeah sammi but it cost

Answer 9

you can earn money by answering questions there too!

Answer 10

accordingly there are people who pay the money.

Answer 11

anyway ken could you help me figure this problem out?

Answer 12

you can do the first derivative , and then do the second.

Answer 13

for example, suppose f(x)=x^3+6x^2+4x+3
then f'(x)=3x^2+12x+4
f''(x)=6x+12

Answer 14

how to i find the first der. from the graph

Answer 15

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.

Answer 16

back up a little bit, do you know the basic derivatives?

Answer 17

polpak is right, but it is just perceiving by eyes, not calculating

Answer 18

if i have numbers i can find der., but there is only letters

Answer 19

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..

Answer 20

it's the same.

Answer 21

im not understanding

Answer 22

f'(x) stands for the slope of the tangent line at (x,f(x)).
f''(x) stands for the change of the slope.

Answer 23

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

Answer 24

i do have a graph so where it is sloping below 0

Answer 25

Is the graph of f, or of f'' ?

Answer 26

suppose f(x)=ax^3+bx^2+cx+d
then f'(x)=3ax^2+2bx+c
then f''(x)=6ax+2b

Answer 27

f'(x)

Answer 28

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.

Answer 29

i don get ya.(><)

Answer 30

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