Does Macbeth trust the vision of the dagger?

I don’t think so because if he trust the vision of the dagger he would be sure with out questions that he can kill the king

What mightthe symbol of the dagger represent? Why?

I think that the dagger symbolises what will happen in a future if he tries to kill king Duncan because if he tries to kill the king one of them should die like trying to tell him that if he tries to kill king Duncan it would’t end up well