1. The problem statement, all variables and given/known data So I have the following hyperbola x^2/4 - y^2/4 = -1 I need to find the focus points of this hyperbola. What is some analytical way to do this ? Thank yoU! 2. Relevant equations I don't know... 3. The attempt at a solution I need some analytical way to be able to do this. Can somebody give me a hint ?