Recent content by mlb123

Yes, it is really so. That's why I wasn't understanding the question as much - it didn't want me to answer the question in the manner that I would normally turn to. Thank you for your help, as it confirms the answer that I got a few days ago a little after I posted this.

So I have a function f(x,y,z)=3+4(x^2)-9(z^2)-4xy-12yz. I need to find if (0,0,0) is an optimal number. I know I have to get it into the form of 3+(___)^2+(___)^2+(___)^2 or 3-(___)^2-(___)^2-(___)^2 to find if it's a max or min. But I've been working on this all day to no avail. Any help would...