Author Topic: Can I calculate this with Casio FX-991EX?  (Read 556 times)

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Offline Giorgio124

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Can I calculate this with Casio FX-991EX?
« on: August 05, 2021, 10:04:16 pm »
Hello, everybody!
Can I calculate this type of equation with the Casio FX-991EX?

1000
----------  * 3 = 9
1000 + x

It's obviously a voltage divider when you know the voltage you want to get and you need to identify the resistor type.

If not, which model can do that?
Thanks!
« Last Edit: August 05, 2021, 10:10:10 pm by Giorgio124 »
 

Offline 5370H55V

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Re: Can I calculate this with Casio FX-991EX?
« Reply #1 on: August 05, 2021, 11:46:39 pm »
Assuming you want to solve for X, the casio can do that with the Solve function.

Btw, that equation comes out to X=-666.67  :o
« Last Edit: August 05, 2021, 11:49:22 pm by 5370H55V »
 
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Offline Giorgio124

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Re: Can I calculate this with Casio FX-991EX?
« Reply #2 on: August 06, 2021, 08:54:33 am »
LOL  ;D You're right. I should have switched 3 and 9.

Thank you very much, I'm buying that model then.
 

Online BlackICE

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Re: Can I calculate this with Casio FX-991EX?
« Reply #3 on: August 06, 2021, 09:24:46 am »
I'm old school, why would anyone need a special calculator to solve this equation?
 
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Offline DavidAlfa

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Re: Can I calculate this with Casio FX-991EX?
« Reply #4 on: August 06, 2021, 10:56:54 am »
If you use that formula very often, it's a pain in the ass to repeat all steps everytime. Also, for sure you'll make mistakes and need to redo it.
That way you simply type "x" and get the result.
Maybe old-schoolers love losing their time that way ;D
« Last Edit: August 06, 2021, 10:59:29 am by DavidAlfa »
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Online BlackICE

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Re: Can I calculate this with Casio FX-991EX?
« Reply #5 on: August 07, 2021, 12:20:18 am »
I just never found the need nor desire to use a programable calculator. I'm so old I started with a slide rule, moved on to a TI SR50 scientific calculator, then to a TRS 80 computers. The affordable programable calculators came out much later than a TRS80, not counting the expensive early ones like the HP65. I found PC as much easier to program than any calculator so I never had much interest it ever programming a calculator. They are a PITA! Much easier to use a spreadsheet for the easy stuff and write a program when you need to do more.

Nowadays I would assume most people have smart phones which would easily replace a calculator and are much easier to find the right app or to program to do what you want. Another choice are the numerous online calculators on the web that you can access. Of course you don't have access to the internet, or a smart phone a calculator is the best choice.
« Last Edit: August 07, 2021, 12:23:55 am by BlackICE »
 

Offline mathsquid

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Re: Can I calculate this with Casio FX-991EX?
« Reply #6 on: August 08, 2021, 03:04:46 pm »
If you use that formula very often, it's a pain in the ass to repeat all steps everytime. Also, for sure you'll make mistakes and need to redo it.
That way you simply type "x" and get the result.
Maybe old-schoolers love losing their time that way ;D

If I used this formula a lot, I'd solve for x and then put the formula into a spreadsheet (or octave or something like that).
 


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