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## Homework Statement

I am very uncomfortable with the concept of "level sets" and don't quite get what it means.

## Homework Equations

y = 2(x1)^2 - (x1)(x2) + 2(x2)^2

y = 2x1^(1/2) * x2^(1/2)

## 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?