Hey, I had a math exam today and there was the following problem: For which positive integers n is (4n + 1)/(n * (2n - 1)) a terminating decimal?
With terminating decimals are meant non-periodic numbers like 1.25 or -2.22, I guess. My first idea was to write this fraction as 6/(2n - 1) - 1/n or 4/(2n - 1) + 1/(2n^2 - n) and then create a system of equations, where the first and the second denominator are equal to something like 2^p * 5^q.
How would you proof this?

Hey guys,

I was thinking about making a program, which integrates a function symbolically, this sounds stupid and very hard, but is it really so difficult? Which algorithms are used by software like Mathematica?
I think it'd be possible, because one genius in my school made a program, which calculated the derivative of a function without using Symbolic! Well, i know calculating derivatives is a lot easier than calculating integrals, but it should be possible with Asm or so? Such a program would be so cool.

~ Anima

Hey,

at first: sorry for cross posting, but in the german section nobody answered me yet.
A few days ago, I got Mario Kart 7 for Nintendo 3DS and searched for a Mario Kart clone for TI-84 Plus on ticalc.org
Sadly I didn't found any good one, so I want to ask you, how difficult it is to program such a game in Axe or TI-Basic + xLib.

Hello,

is there a program to analyze mathematical functions with the TI-84+?
I mean things like monotony, symmetry, range for f(x) and so on that can't be done with the commands in the CALCULATE menu.
If there isn't such a program available, I wanna try to develop it. I already know that most of this stuff can be done with the first derivation.

So is this possible in pure TI-Basic?

"Hey people,
I recently got a very useful app called Zoom Math discovered. You can download it here.
Unfortunately the app is only a free trial version has to offer, not all features of the full version. Only after you have purchased a registration key, you can use all the features of this computer algebra system. And here's the catch: Math Zoom costs $ 500 99.95. That's a lot of money. That's why I've been trying to guess the ten-digit registration code (xD), only this way: there are 9,999,999,999 possible combinations of numbers. In order there to get the right key, you need as much human time and patience ...

Well, I have explained first of all with the system: To purchase a Registration Key, you may specify the allocation by the app "zcode" on the website. Then, one after the payment sent an e-mail with the key. This can be concluded that the key using the zcode (which varies from calculator to calculator) is calculated. It is therefore possible to crack the key ... I simply lack the calculation algorithm.

I will summarize again. To get the full version of Zoom Math 500, I must either:
- $ 99.95 pay
or
- Guess the registration key from 9999999999 number combinations


Now my question:
Is it possible a program (in assembly) to write to me indicating that the source code of the app (a sort of "disassembler" for .8 xk files)?
Or you could develop a program that is in the app "hacks" and takes the guesswork for me (much like in bruteforce)?"

By the way: The above text was translated by Google Translator from German into English (because I was too lazy). Maybe the result is a little bit crappy.
The original German text you can find here.

Hey guys,
i wanna make a great Math program in TI-Basic (oh i know, this sounds boring for you, it's rather a little project for school).
The problem is, that I don't really know, what would be very usefull for my classmates. I'm in grade 9, so this year we've got:

- potencies & roots (also the laws)
- quadratic functions and potency functions
- quadratic equations
- rectangular triangles (Pythagorean Theorem + sin, cos & tan)
- circle, circular cylinder, circular cone and ball (volume + area)
- analyze data (statistics, mean, ...)

I hope you can give me a few ideas for the functions of my program. Only a simple quadratic solver would be crappy.

Nabnd,
ich arbeite momentan an einem kleinen TI-BASIC Programm, dass folgende verschiedene Zahlen in andere Systeme konvertiert:
Binär -> Dezimal
Dezimal -> Binär
Hexadezimal -> Dezimal
Dezimal -> Hexadezimal

Derzeit beschäftige ich mich damit, eine Binärzahl in eine Dezimalzahl zu konvertieren. Wie das rechnerisch geht weiß ich schon, aber wie ich das ganze dann in TI-BASIC umsetze, nicht. Deswegen bräuchte ich etwas Hilfe von einem Matheexperten, kann mir jemand einen kleinen Denkanstoß/Codeschnipsel/o.ä. geben, mit dem ich das schaffe? Wäre sehr nett.

Hey, guys. I need graphics (especially a title screen) for my new RPG, called "Lufia - The Legend Returns". The original is for the gameboy and I'd like to make a remake for the TI-84+. But I'm a very bad designer, so I need at first a picture like that:



Later I need many Lufia sprites.
Can anyone help me? And sorry for my bad grammar, I'm German.