Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

ksaimouli Group Title

use the 2nd derivative test to find the local extrema for the function

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. ksaimouli Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1352126604670:dw|

    • 2 years ago
  2. ksaimouli Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    @Aperogalics

    • 2 years ago
  3. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    use the product rule

    • 2 years ago
  4. ksaimouli Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    i got that

    • 2 years ago
  5. ksaimouli Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1352126927234:dw|

    • 2 years ago
  6. ksaimouli Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    set =0 and find critical points

    • 2 years ago
  7. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    u got it wrong!!!

    • 2 years ago
  8. ksaimouli Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    !!!

    • 2 years ago
  9. ksaimouli Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1352127080538:dw|

    • 2 years ago
  10. ksaimouli Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1352127105772:dw|

    • 2 years ago
  11. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    \[ \large y'=e^x+xe^x=(1+x)e^x \]

    • 2 years ago
  12. ksaimouli Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    dont factor the first one yet

    • 2 years ago
  13. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    so \[ \large y''=e^x+(1+x)e^x=(2+x)e^x \]

    • 2 years ago
  14. ksaimouli Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    |dw:1352127282428:dw|

    • 2 years ago
  15. ksaimouli Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    okay after that

    • 2 years ago
  16. ksaimouli Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    i dont get that part

    • 2 years ago
  17. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    solve y'=0

    • 2 years ago
  18. ksaimouli Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    what is e^x=0

    • 2 years ago
  19. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    \[ \large 0=y'=(1+x)e^x \]

    • 2 years ago
  20. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    so x=-1

    • 2 years ago
  21. ksaimouli Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    wait how did u get 1 it is (x+2)e^x right so e^x=0 (x+2)=0

    • 2 years ago
  22. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    no. u r looking for extrema.

    • 2 years ago
  23. ksaimouli Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    i know i am finding the critical points by setting=0 and then using sign chart i will find it

    • 2 years ago
  24. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    yes. the only critical point is x=-1

    • 2 years ago
  25. ksaimouli Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    u r using first derivative right

    • 2 years ago
  26. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    then \[ \large y''(-1)=(2+(-1))e^{-1}=(1)e^{-1}>0 \]

    • 2 years ago
  27. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    yes i'm using the first derivative

    • 2 years ago
  28. ksaimouli Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    but question asks for second derivative

    • 2 years ago
  29. helder_edwin Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    so y'' is positive when x=-1. what does this tell u??

    • 2 years ago
    • Attachments:

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
  • 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.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.