1. The problem statement, all variables and given/known data I am very uncomfortable with the concept of "level sets" and don't quite get what it means. 2. Relevant equations y = 2(x1)^2 - (x1)(x2) + 2(x2)^2 y = 2x1^(1/2) * x2^(1/2) 3. The attempt at a solution I'm not even sure where to start... Can anyone please give me some basic knowledge of how to approach these problems?