You have a Casio fx-991CW that did it in approximately 1 second? That's significantly faster than the fx-991EX Classwiz. Impressive.

In the USA, it is a lot more expensive, but aside from the price, it is a very good device. I think you'll be happy w/ it.

@@scottcollins7513 Nah I live in Germany 😅

​@@BenBensen293​ I should have figured that out from the D in dex. I'm guessing TI sell the 30X Pro MathPrint in Germany. Hope so.

Agreed. RPN takes a little bit of practice, but it quickly becomes second nature.

@@scottcollins7513 i got a 28C myself and im trying just that!

None that I am aware of -- in fact, this seems to be something people dislike about a generally well-liked calculator. The TI-36X Pro and TI-30X Pro MathPrint maintain calculation history even after being powered off. Here's a video I made about the latter -- kzbin.info/www/bejne/gZSxapqrhbGqiLM

I guess I wanted to show something that I had found helpful, but I can see why it would be frustrating in your situation where you are just trying to use it without any modifications. Were you able to get the solver working yet? If not, I could see if I can find info to help or possibly even make my own short video. Let me know.

@@scottcollins7513 Thank you for replying. My feedback is that many people watch your videos to learn, so keeping the standard settings is important for them to replicate the steps and understand how it works. Thanks.

@@JohnUsp Good point, John. I may make a video showing this if I cannot easily find one already made on youtube. Take care.

Good observation! I did not think about that. Some people in the US also do their 7 that way.

I am glad you found it helpful. Thanks for leaving a comment. Hope your exam went well.

@@scottcollins7513 Yes it went well ! I used the method in the video to solve an equation that required the use of iterations. Thanks again.

Thank you for the encouraging words!

I would not be surprised if it was different. I know for sure the Beast was "tamed" over the years.

I bought mine in 2022 here: www.rarewaves.com/products/3243480105927-ti-30x-pro-mathprint

Yes. Hit the DEL key once. All of this type of calculator (TI-36X Pro, Casio fx-991EX, etc.) are capable of editing the line before it is executed (by hitting the = key).

You can use the initial guess for x to increase the likelihood of it finding the other answer. Alternatively, you can use the quadratic solver to find both roots.

That is impressively efficient. Thank you for leaving a comment and for bringing this calculator to my attention -- I know nothing about this calculator, so I plan to watch some videos on it. Cheers.

It is giving you the correct answer (not sure why you have a zero in front of the 2, but it's technically still the correct answer). The L-R=0 is just the calculator telling you that it found an answer where the difference between the Left and Right sides of the equation are equal -- in other words it found an answer.

Yes, still out here.

@@scottcollins7513 🤯👏

The most likely culprit is that you forgot to put a negative sign in front of the 3x on the right hand side of the equation.

Log base e is known as the natural log and looks like lowercase LN ("ln") on the calculator. That's the easiest way.

It has a dedicated key on the calculator keyboard

You are welcome!

log(50) This would give you "log base 10 of 50"

Sadly, Joe, it cannot handle complex numbers within a matrix. I just tried putting an "i" into the matrix and rec'd the message "Error - Input must be Real".

I am not in the habit of using this functionality, but good for you pointing out its usefulness. Thanks for leaving a comment.

I did not realize the CW offered that advantage. thanks for sharing the info.

Appreciate you leaving a comment. It's interesting how fond of a device one can become.

Thanks. Yes, it's aggravating when you want a simple how to and someone stretches it into a 10-minute video for whatever reason.

Can you provide a simple example of the bug? You have me curious. Thanks.

@@scottcollins7513 OK. Maybe I don't understand something... The calculator allows you to raise complex numbers to powers. But when trying to extract the root from them, an error occurs. For example: sqrt(9i) or (9i)^(1/4) = 2.12+2.12i. but the calculator reports an error. Same result with polar coordinates

@@scottcollins7513 ok. For example sqrt(9i)

@@scottcollins7513 He raises complex numbers to powers normally. But when extracting the root it reports an error. Which is strange. This is one of the basic mathematical operations. And it works in more expensive models. Do I really have to buy a $300 calculator to have this feature?

@@user-em1de8zt5p I see. I'm not sure this is a bug, but it is definitely a limitation. The TI-30X Pro MathPrint has the same issue. It cannot find sqrt(9i). I wonder if any sub-$40 calculator can do this correctly? Granted, it does not come up often in my experience, but perhaps it is something that arises in Electrical Engineering, for example. Thanks for pointing this out; it is a good observation.

Hi, @fedpoi. I have not used the hp48gx in quite a long while. But, perhaps this is a good reason to get it back out and see if I can figure out how to do what you are asking. If I do, I will let you know.

@@scottcollins7513 Don't worry, I've already fixed it. I had misspelled the command. Thank you very much for your help.

​@@fedpoiHappy to hear you got it working.

I think most of the time you get away with it, but it is a bad habit. For example, in normal mode, if you use subtract (minus) key to enter -6, the calculator will assume you want "Ans-6" (the previous result minus 6). If you instead use the (more proper) "(-) negative" key, the calculator will simply assume you want "-6". Also, if you switch to a different brand of calculator, you may find it less-tolerant of using subtract key in place of negative key.

@@scottcollins7513 Interesting, thank you !

I checked to see if I could duplicate the pi*12.5^2 bug outlined here: www.nickweil.com/2012/01/ti-36x-pro-programming-bug-info-video.html. I could not duplicate the bug. It seems that TI addressed and eliminated the bug on the TI-30X Pro. I was not able to find anything walking through the temperature conversion error alluded to on the wikipedia page. If you can explain that one or provide a link, I will check it on my TI-30X Pro.

Glad it helped, Afin. Thanks!

You need to hit the = sign ONE more time.

You use the same approach, but hit the / (division) key to input any/all denominators. It ends up looking something like: CONVERT(10,000,000_lbf*ft/min,1_hp) Hit enter and get 303.03030303_hp

It is amazing how powerful these calculators are for the money. Ideal for students, too. Much better value than the all-too ubiquitous TI-84 variants.

Glad you found it helpful. Thanks for letting me know, Faruk.

It is the difference between ROOTS (aka "Zeros") and FACTORS. The calculator is telling you what x values when plugged back into the equation will give you a y value of ZERO. To get the factors you need to reverse the sign. When calculator gives us the ROOT x=2, we can then use that to determine that the corresponding factor will be (x-2).

Always happy to hear it was helpful. Thanks for taking the time to leave a comment.

I double checked w/ Wolfram Alpha *and* verified that I got the same answer on my fx-115ES PLUS 2nd ed. That is truly impressive! I am also impressed that you figured out that it would do this. Thank you for sharing this find. It is one of the more interesting things I've learned about these calculators in a long while.

You sound like a true "power user". Thank you for sharing your knowledge. Best wishes.

It is a 1st gen "ReMarkable" e-ink tablet. I got it for a consulting job I had - it was great for marking up PDF documents. It is an impressive device, but quite pricey.

@@scottcollins7513Many thanks for letting me know. Much appreciated.

What model of calculator do you have? Does it have the "x" button? One thought is that you have it in imaginary mode or some mode that is dis-allowing you to use the x. I'm not sure.

Buttons 1 to 6 are used for entering Hexidecimal numbers, I believe. I wonder if they moved them to a different menu on your version of the calculator - mine is probably 4 years old at this point.

Your speaking of gradians (e.g. 50 gradians = 45 degrees)? Regardless, I believe you would have to write a program to do that, but it would be relatively simple and you would only have to select that program (function) any time you wanted to do the conversion.

Thanks, "Noah". Yes, the DM42 is a great little machine, and I too have access to an inexpensive scientific calculator should the need arise to do the things covered in this video. Thanks for leaving a comment and enjoy your DM42 (and TI-36X Pro)!

AGREE. Definitely inferior in this regard. Good point.

You can do a "nested" derivative. For example, if I wanted to find the 2nd derivative of y=x^3, I could put in the following: d{ d(x^3)/d(x) } / d{x} Sorry the formatting is not more flexible, but the idea is that for the numerator you are nesting in another d()/d() function.

I did this in CAS mode and it gave the expected "6x" answer.