Solved
See the pic. Sorry it is in Finnish. The same in GG5 and 6.
M
The same problem 
See the pic. Sorry it is in Finnish. The same in GG5 and 6.
M
It's giving local min/max isn't it? I think that's intended
But with a parabola it works fine.
But with a parabola it works fine.
Somehow I am able to duplicate my comments.
It works OK with this also f(x) = x³ - 2x - 1 / 2 x + 2.
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