A community for students. Sign up today!
Here's the question you clicked on:
 0 viewing
 one year ago
Determine the derivative, all the critical numbers and the intervals of increase and decrease
y=5x²+20x+2
 one year ago
Determine the derivative, all the critical numbers and the intervals of increase and decrease y=5x²+20x+2

This Question is Closed

burhan101
 one year ago
Best ResponseYou've already chosen the best response.0\[\huge y'=10x+20\] \[\huge 0=10x+20\] \[x=2\]

burhan101
 one year ago
Best ResponseYou've already chosen the best response.0i get : intervals of increase x<2 intervals of decrease x>2 but the answer key says the opposite

Abhishek619
 one year ago
Best ResponseYou've already chosen the best response.0when \[y \prime >0, \] then increasing.

burhan101
 one year ago
Best ResponseYou've already chosen the best response.0what's in intervals of increase / decrease tho?

koymoi
 one year ago
Best ResponseYou've already chosen the best response.0I got the same answer as you @burhan101 intervals of increase x<2 intervals of decrease x>2

Abhishek619
 one year ago
Best ResponseYou've already chosen the best response.0x>2 it decreases x<2 it increases.

johnweldon1993
 one year ago
Best ResponseYou've already chosen the best response.0Right...I as well @koymoi ...I think maybe your answer key is wrong @burhan101

burhan101
 one year ago
Best ResponseYou've already chosen the best response.0think the answer key's wrong then ?

burhan101
 one year ago
Best ResponseYou've already chosen the best response.0yeah, i thought it was a fairly straight forward question

dan815
 one year ago
Best ResponseYou've already chosen the best response.0graph it and ull know for sure

dan815
 one year ago
Best ResponseYou've already chosen the best response.0oh oops that shud be + when i multiplied by 5

genius12
 one year ago
Best ResponseYou've already chosen the best response.1@burhan101 u don't need calculus to find intervals of increase/decrease. This is a parabola with a negative leading coefficient so it opens down. Using b/2a we get b/2a = 2, which is the xcoordinate of the vertex of the parabola. Since it opens down, function is increasing on \(\bf (\infty,2)\) and decreasing on \(\bf (2,\infty)\)
Ask your own question
Ask a QuestionFind more explanations on OpenStudy
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.