A community for students.
Here's the question you clicked on:
 0 viewing

This Question is Closed

DanielHendrycks
 2 years ago
Best ResponseYou've already chosen the best response.0My second derivative test failed since it equaled 0, so I am not certain how to proceed.

Waynex
 2 years ago
Best ResponseYou've already chosen the best response.2Can you show what you did for the second derivative test? My second derivative test shows "ACB^2" to be negative, which is indeed indicative of a saddle point.

DanielHendrycks
 2 years ago
Best ResponseYou've already chosen the best response.0\[12x\cdot6[6(x^2+y)\cdot6(x+y)]^2=12\cdot0\cdot6[6(0+0)\cdot6(0+0)]^2=0\]

Waynex
 2 years ago
Best ResponseYou've already chosen the best response.2It looks like you took did this:\[F _{xx}*F _{yy}[F _{x}*F _{y}]^{2}.\]What you need to do is this:\[F _{xx}*F _{yy}(F _{xy})^{2}.\]Notice that the last part there is the second derivative with respect to x and y. You took the first derivative with respect to x and multiplied by the first derivative with respect to y.
Ask your own question
Sign UpFind 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.