# [SOLVED]locate f' f'' and f''' on graph

#### karush

##### Well-known member
View attachment 442

Which of the points labeled by a letter have

(a) $f'$ and $f''$ non-zero and the same sign B, E

(b) At least two of $f, f', f''$ equal to zero A, C, D

not sure if these selections were correct and was ??? about D in the slope appears to be zero

f' is about slope f'' is about inflection pts and increasing and decreasing I presume

#### MarkFL

Staff member
I agree with your answer for a), but I would remove one of the points from b). I don't want to say which, as I want you to re-examine on your own.

#### karush

##### Well-known member
well, i would remove D since has neither zero on x or y axis but my ? is it does have a m=0

not absolute sure what is meant by zero's here

#### MarkFL

Staff member
I would keep D, as the slope appears to be zero there, and it appears that curvature is changing there also.

#### karush

##### Well-known member
ok how about C since at f it has x=0 at f' it has m=0 but f'' there is no inflection pt.
or is it .....