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# HP Prime "Cannot Find Solution" when solving two equations

04-20-2019 05:45 PM

I am trying to solve only two equations using the Solve App and it fails at every attempt. I just updated to latest firmware 20181016. The equations are super simple algebra:

S=(P*L*C)/I

I=pie/64*(D^4-E^4)

I made sure all the variables are in the system already. It will solve them individuall, but not both at the same time. I tried this on my sons HP Prime with firmware: 20170710 and it worked two times, then stopped as well with the "Cannot Find Solution".

I also tried it on the emulator on my windows PC without any luck. Same issue.

Do I have a setting that is off or set incorrectly?

Any help would be greatly appreciated.

Thanks,

Geoff

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## HP Prime "Cannot Find Solution" when solving two equations

04-20-2019 07:43 PM - edited 04-21-2019 08:48 AM

Hi!, @DGRCarter :

IMHO, you must change the "I" variable with other letter per example "J" why "I" is interpreted, as imaginary number.

S=(P*L*C)/J

J=pi/64*(D^4-E^4)

Now, see the image and Solve first the "J", as ...

For Solve, press the Key "Num" and complete the data of variables "D" and "E", as this example values ... D=4; E= 2; then moving the bar to "J" and press Solve. Now, you can see ...

Now, with Symb uncheck "J" and check "S" in the first equation and put the values of "P", "L" y "C" with example values P=8, L=9 and C=5. Next step, move the bar to "S" and press Solve. Then you can see, the result ...

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## HP Prime "Cannot Find Solution" when solving two equations

04-21-2019 11:38 AM

Hello Make,

I can get that method to work with the "I" variable as well, but the point is to solve both simultaneously. If i hit the solve button between 10-20 times it will eventually solve simultaneously. Also, if I remove the exponents from "D" an "E" it will solve right away.

I think its in the software...

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## HP Prime "Cannot Find Solution" when solving two equations

04-21-2019 04:03 PM