Got Homework?
Connect with other students for help. It's a free community.
Here's the question you clicked on:
 0 viewing
harharf
Group Title
For the following equation do the following:
a) find f'(x) and an accompanying sign analysis (show increasing/decreasing)
b) the coordinates of any relative extrema
c) f''(x) and an accompanying sign analysis (show concave up/down)
d) the coordinates of any inflection points
e) the coordinates of all x and y intercepts (i do not need you to do this for me)
f) the equations of all asymptotes
g) an accurate sketch of the graph (i do not need you to do this for me)
f(x)=x^4+2x^33x^24x+4
... I !#$*ING HATE THIS QUESTION >_<"
 2 years ago
 2 years ago
harharf Group Title
For the following equation do the following: a) find f'(x) and an accompanying sign analysis (show increasing/decreasing) b) the coordinates of any relative extrema c) f''(x) and an accompanying sign analysis (show concave up/down) d) the coordinates of any inflection points e) the coordinates of all x and y intercepts (i do not need you to do this for me) f) the equations of all asymptotes g) an accurate sketch of the graph (i do not need you to do this for me) f(x)=x^4+2x^33x^24x+4 ... I !#$*ING HATE THIS QUESTION >_<"
 2 years ago
 2 years ago

This Question is Closed

colorful Group TitleBest ResponseYou've already chosen the best response.0
well what have you got for f'(x) ?
 2 years ago

harharf Group TitleBest ResponseYou've already chosen the best response.0
2(x+2)(x1)(2x1)
 2 years ago

terenzreignz Group TitleBest ResponseYou've already chosen the best response.0
You know, I think it's hard to put all the answers for this, we need a table of sorts :D
 2 years ago

colorful Group TitleBest ResponseYou've already chosen the best response.0
yeah these are just long a painful first thing is to mark the zero's, because that tells us where the sign is changing
 2 years ago

colorful Group TitleBest ResponseYou've already chosen the best response.0
so set\[f'(x)=0\]and you will get a set of intervals between each zero
 2 years ago

colorful Group TitleBest ResponseYou've already chosen the best response.0
test a point in each interval and see if in that interval f' is >0 or <0 f'>0 means increasing f'<0 means decreasing
 2 years ago

harharf Group TitleBest ResponseYou've already chosen the best response.0
I think I got it, thanks for the help! (: if you want you can check over what i did to see if i got the right idea: to find f'(x) i used synthetic division and got x2+4x+4, then i factored it so i could do the sign analysis and got 2(x+2)(x1)(2x1) Increase  (2, 1/2)U(1,infinity) Decrease  (infinity, 2)U(1/2,1) To find f''(x) i simply used product rule (f'gh+fg'h+fgh') and got (2x1)(2x+4) and did sign analysis Concave up  (infinity,1/2)U(1/2,infinity) Concave down  (1/2, 1/2) ... of course this is trying to compress 3/4 pages of work into a post, but i think you get the general idea.
 2 years ago
See more questions >>>
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.