Please Help using fsolve (error)

What is the mistake?

Answer 1

[Torsten]

f1 = (5+x1+x2)/(50-2*x1-x2)^2/(20-x1) - 4e-4;
f2 = (5+x1+x2)/(50-2*x1-x2)/(10-x2) - 3.7e-2;
f=[f1;f2]

And it seems that you don't have a licence for the optimization toolbox or the optimization toolbox is not installed.