Decimal problem using solve
08-26-2018, 02:57 AM
Post: #1
 vterez Junior Member Posts: 5 Joined: Aug 2018
Decimal problem using solve
(Brazilian here, sorry if my English is bad)
I was trying to use the solve function to do my homework and I noticed something really weird:
I was solving this equation
70/(23000+z)=x*177.35+(1-x)*1.133
(23000+z)*(x*2571.11+(1-x)*696.21)=23000*104.91+z*2779.65
on my calculator and for some reason I received {} as my answer.

So I turned my computer on and typed the same equation on HP Prime Virtual Calculator and I got the right answer. The fact that my calculator didn't solve this really annoyed me, so I tried to change a few things (reducing a few terms, calculating partial results) and found out that if I changed (x*2571.11) and (x*177.35) to (x*257111/100) and (x*17735/100) and kept everything else (I could change other things but this was enought) the way it was in the first place, I would get my result.

At first sight I thought it could have something to do with decimal numbers multiplying the variables, but I didn't have to change (z*2779.65) nor (x*696.21), so I gave up trying to figure it out on my own.

Does anyone know if the solve function has problems with decimal numbers or something like that?