[This is a follow-up to the thread
http://forums.wolfram.com/student-support/topics/29759 - FM]
The question answered was for a fixed value of t.
The expression is now a function of two variables and as such the question drastically changes.
I am trying find the region where the expression below is positive and negative. I realize from Pot3D that it takes both values. Can somebody give me some suggestions as to how I can do this. Thank you
Expression=(1/100) b(-b + t) + (-100 + t) Log[100 - b] - (-100 + t) Log[100 - t]