Replacing "x" is not right!

[Rudi]

Dear All
My Softwareversions:
HP Prime Graphing Calculator Software Version: 2017 11 15 (13011) BETA
and HP Connectivy Kid software version: 2017 11 15 (13012) BETA

Valid only for the CAS View!
Basically, variables may not yet be initialized.
1. This can be done either with result () or purge ({list of variables})
2. Variables can then be used in formulas.
3. Only when values have been assigned to the variables are the variables automatically replaced by their values.

   

Another Example:

   

A happy and healthy new year.
Rudi