HP Prime - Brain Teaser

[eried]

The main issue is the generic syntax error the apps return. I checked the geometry app first and it is so flickery and cumbersome to use that you can barely make use of it.

Then just checked the parabola app, and it is just a gimmick to add an icon.

Finally with the solver, if you entry the expression directly, of course you get the Syntax error that tells you nothing, and the struggle starts changing something, enter, syntax error, changing something, enter, error, etc.

But I still haven't memorized the reserved variable rules so I just try anything. Plus using multiple letter variables converts them to V*A*R. Nice that I don't have to use it for calculus anymore because I really enjoy the programming/graphics side of the device.