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09-17-2019 12:35 AM
Type [SPC] [ - ] (the problem is hitting [ - ] to start an entry assumes you want the last item, subtract the next item)
Or, the better solution is to use the [ +/- ] key next to the x^2 and ( ) keys.... negation is what you are really trying to do here.
Although I work for the HP calculator group as a head developer of the HP Prime, the views and opinions I post here are my own.