Hi all

This is my first post, so forgive any errors. Firstly I am NOT a mathematician; I just bought the above calculator (new) after reading different reviews, as a machine that would help me learn basic arithmetic and anything else I’m likely to need.

I started doing a list of simple combinations of the basic operators. I tried to work these out myself and then use the calculator to confirm or deny my result. It was some time in, and after huge amounts of frustration, that I realized the calculator was occasionally giving the WRONG result!? What I mean by this is that it gave a different result to other calculators?

My question is, is the calculator faulty, or is there another reason? I’m going to try and attach a pic of an example, the result of which, according to several other calculators, is -421

Okay, can’t find how to attach pic of calculator result, so here’s the sum followed by the given result.

11+-3/2(4^2*9)*2

10.97916667

Any help very much appreciated!