Hp prime calculator Cannot Solve simple equation

Hello,
I'm trying to solve
solve( (2)^x = (x)^2,x)
But the calculator cannot solve or am I doing somthing wrong?.
I lost my TI Nspire CX and I though that HP Prime, since is a recent modern version, were able to solve something simple as that, I am wrong. (TI Nspire solved it ).
How solve the above equation using the HP Prime? I'm seriusly thinking to return this back.
Thank you
This question was solved.
View Solution.

Oops! Quite right. In general, all symbolic math work should be done in the CAS; that's what it's for. Home is intended for ordinary number-crunching, not symbolic math. Sorry for not pointing that out.
-Joe-

Similar Messages

HP Prime issue on solving C=S/M equation

Hi,
I am trying to solve a simple equation C=S/M in the solver app.
If I start from scratch I do get results with small numbers for S & M. However, when I use large figures (1,900,000/2,000,000), I receive a "Bad Guess(es)" error. The strangest thing is that if I use the emulator in my PC, I always get the right result without any issues. I have tried using other variables, clearing them all together and it always comes back to the same issue. I have also tried with Solver variables and user variables and it has no benefit
It looks like the variables are not updated when I enter new values in the Numeric view of the Solver app. But that is too large an issue to really be it.
Thanks in advance for any support.
Carlos

Never mind... I found the solution, however odd it is.
I was trying to solve the easy equation C=S/R and occasionally obtain the Bad Guess(es) error when the numbers were large (C=1,900,000/2,000,000) for example. Once this happened, the solver would not even work with lower magnitude numbers.
I noticed that it appeared that the variables in the equation were not updated when I keyed in the numbers in the Numeric view of the Solver app.
If I performed the same solving process with the emulator in my PC, I had no issues whatsoever, regardless of the magnitude of the numbers.
Then after reading that the latest firmware update provided the Digit Grouping option, I sort of imagined something could be wrong with it when large numbers were keyed in. Anyway, the emulator does not have this option set in the software and it worked, so it sort of led the way.
I finally went to settings and selected a Digit Grouping option with no thousands separator and voila... it worked smoothly.
I think it may be something related to how the numbers are displayed vs how they are stored in the variables that led to this issue.
Hopefully if someone gets to this same issue, she/he would get some info about it. I also posted this in the Google group in case someone in the HP team may see it and directed so that in a future firmware it is solved.
Regards,
Carlos

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Hi, I'll get right to the issue i'm having with my HP Prime calculator. Recently during an exam where i was calculating the moments of inertia of certain bodies i encountered what i can only describe as a bug in the software because I can't figure any other reason why it would kick out the answer it did for such a seemingly simple function. After I had done all the laboreous work of simplifying the differential equations I just needed to add some simple fractions. As i have been operating this calculator for several weeks now, the only way i can get it to show a fraction in exact form is to type (number) / (number) and it shows it in exact form. In my case and for this particular calcuation I input (3/20) - (1/7) "enter". the answer Prime gave me was noticably unsimplified given that i needed it in simplified form. although the numerical, non-exact value was almost correct (.00714285714309 instead of the correct value of .00714285714286), generally Prime kicks out a simplified value. What it gave me was 214500215/30030030099 instead of 1/140. i'm just curious if i need to do something different to get a simplified/correct answer on the first go rather than having to do a work-around.
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If you want an exact and simplified answer on the first go, do your calculation in CAS view rather than Home view. Try this experiment.
1. Go to CAS view, and enter your calculation (3/20)-(1/7). The Prime will respond with 1/140, the exact answer. Now press the a b/c key. The Prime will respond with 0.00714285714286, the approximate decimal equivalent. Keep pressing the a b/c key, and the Prime will toggle between the two answers.
2. Now try the same steps in Home view. The Prime will toggle between 0.007142857143 and 214500215/30030030099.
Remember, the true decimal value for 1/140 is an infinite repeating number. Since every calculator can store only a finite number of digits, it must truncate the value after a set number of digits, and this introduces a small error. The big fraction you got in Home view is not wrong, and it's certainly not a bug. It's just that Home view is not designed to handle exact values. The CAS, on the other hand, is designed to handle exact values, so when you tell it to show an approximate answer, its decimal form will be closer to the exact value, namely, 1/140.
The moral of the story is, use CAS view when you want exact values and Home view when you want approximate values. I tell my students to use fractions whenever possible (since those are usually exact) rather than converting them to decimal values. It's far easier to use 1/3 than 0.33333....[infinite number of 3s go here].

Prime calculator stuck in radians?

Hi there, this is my first post on this forum site and hopefully I do all this correct. But my question is how do you switch between radians and degrees (as far as modes) on the HP Prime calculator? I thought it was touch the top right corner and then touch either of the symbols? I could have swore that was the way i did it before; but today when I went to switch to degrees the screen was unresponsive when that drop down menu would appear. So then from the CAS screen I went into settings and tried to change the mode there, and I could select between the two but when I would go back to the CAS screen and then back to the settings screen to see if it did indeed stay, the drop down bar would say radians again... I've tried the reset button on the back and no luck. Is there some setting that I might have turned on so it won't change between modes? I also haven't messed with the firmware at all; all I've done is take it out of the box and charge it up and use it. I've had it now since about last November and as far as I can remember this function used to work.
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Thanks, Nick
This question was solved.
View Solution.

Here's one possible reason for what you were experiencing. Each app can have its own private radian/degree setting in the "Symbolic Setup" screen. (Shift Symb) When an app has the angle mode set here, it usually cannot be changed elsewhere. To restore your ability to set the angle mode in the usual three places (Home Settings, CAS Settings, and the battery icon popup box), press Shift Symb and change the angle setting there to "System".
-Joe-

How to create simple equation automation

Hello,
Is it possible to create a calculator automation? I have to do this same simple equation many times in the day and would love if there was an automation to make things faster. Any thoughts would be very apprecaited!
(inputed number) divided by 1.074 =
Thanks,
Anthony

Something like this?
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Casey,
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Full example.vi ‏139 KB

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Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.
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plz help ... ...
Edited by: shipon_97 on Jul 20, 2010 1:04 PM

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