negative number raised to even power

[Dirk.]

Dear Cyrille,
there is no unclear or bad definition at all: The (+/-) key is supposed to change the sign of the number and it does change the sign of the number. (-2)² is 4. So pressing 2(+/-)² has to give 4 and not -4.

You can try 2(+/-)*2(+/-). The result is 4. In addition you can try 2(+/-) ENTER, press ANS² and get 4 again.

So how do you explain your students that 2(+/-)² is -4 at the prime when entering it using the keyboard?

In my opinion this is simply a bug which needs to get fixed as soon as possible.
(Sorry for my harsh tone, since I'm German, I can't do better :-) )