Why do you think minimize() will do any better when it is called more than once? After all minimize() itselft is sort of an iteration.
So for whatever it may be worth: minimize() will not use a local variable as guess value at all. If you really insist on what you are trying to, you would have to turn minimize() into a function with the guess value(s) as argument.
BTW, its always better to attach the worksheet rather than just showing a picture.
