Question
Find the local maximum and minimum values and saddle point(s) of the function. If you have three-dimensional graphing software, graph the function with a domain and viewpoint that reveal all the important aspects of the function. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.)
f(x, y) = x^2 +xy +y^2 +2y
f(x, y) = x^2 +xy +y^2 +2y
Answers
oobleck
This should get you started.
https://www.wolframalpha.com/input/?i=x%5E2+%2Bxy+%2By%5E2+%2B2y
https://www.wolframalpha.com/input/?i=x%5E2+%2Bxy+%2By%5E2+%2B2y