Program for TI-86 that allows it to factor

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jamesbond007

jamesbond007

Diamond Member
Dec 21, 2000
5,280
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Hey all! I've got a TI-86 and love it to death! I don't like the complexity and display of the 89s and 92s, nor the price. :p

Anyways, I was wondering if there is any program that is downloadable to my TI-86 that can allow it to do factors? Things like x^2-4x-5=0, for example. I know that is an easy one, but when you start working with x^4 and 5th powers, it gets to be a little tricky.

Is it even possible for my calculator to do this with a program or do I need to get a higher model?

Thanks!!!
 
V

Viper GTS

Lifer
Oct 13, 1999
38,107
433
136
Been a long time since I've done anything like that, but I don't believe the 86 will do symbolic manipulation.

I used a 92 with a + module upgrade (like 5 years ago, got the upgrade module the day it came out :D).

Viper GTS
 
Toastedlightly

Toastedlightly

Diamond Member
Aug 7, 2004
7,213
6
81
It is easy... program it yourself. I have one on my Ti-83+. Quadratic formula...

EDIT: That is if you are only doing ones that have x^2 in them.

ax^2+bx+c

Highschool math is fun and easy.
 
B

BullyCanadian

Platinum Member
May 4, 2003
2,026
0
71
Im not sure if it was the ti-86 but back in highschool (last year) there was this kid who would write his own programs in java and put them on his Calculator and it would do EVERYTHING all he would do was put in values, that guy was a genious.
 
jamesbond007

jamesbond007

Diamond Member
Dec 21, 2000
5,280
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71
I'm sorry, but I'm no programmer. ;) I simply hate it!!! :p

I'm just interested in downloading a program to my calculator to allow the factoring ability. :D
 
Toastedlightly

Toastedlightly

Diamond Member
Aug 7, 2004
7,213
6
81
I've never used one that just takes the factors and spits out the whole thing, mine just spit out easy, but could be converted to doing it right. BTW, use the quadratic formula

(-b/2a) +- ((sqrt(b^2 - 4(a)(c)))/2a)

With ax^2+bx+c
 
jamesbond007

jamesbond007

Diamond Member
Dec 21, 2000
5,280
0
71
Toastedlightly, is that exactly what I have to type in the program function? Like I said, I know nothing about programming...quit after a course of QBASIC back in high school. :p

If it is really easy, would you be willing to type out, word for word, character for character, of what I have to type into the programming section of my TI-86?

THANKS! :D
 
Toastedlightly

Toastedlightly

Diamond Member
Aug 7, 2004
7,213
6
81
I just re-read inital post.. lol. Forgot about hte x^5 and stuff. I'd use sythetic division and try using the possible roots. I could do it in C++, but not sure about doing it on the calc (been trying to fig it out all semester)

<- currently in highschool preclc.
 
B

BigJ

Lifer
Nov 18, 2001
21,330
1
81
Originally posted by: jamesbond007
Toastedlightly, is that exactly what I have to type in the program function? Like I said, I know nothing about programming...quit after a course of QBASIC back in high school. :p

If it is really easy, would you be willing to type out, word for word, character for character, of what I have to type into the programming section of my TI-86?

THANKS! :D
Click to expand...

There should be programs to do this that you can download. Look on ticalc.org
 
Toastedlightly

Toastedlightly

Diamond Member
Aug 7, 2004
7,213
6
81
IF you wanted to ghetto it, id say make a program that does sythentic divison, and merge it with another that does quadratic formula.. I've done one w/ the quadratic formula and the teachers hate me (i gave it to one kid, now all of the 1st year algebra kids have it)

to get all possible zeros, you take all of the factors of the last number... those go on the top of a fraction
then take the highest power (the integers attached to the x) and those factors go on the bottom.

so with 2x^3 + 2x^2 + 35x + 6

factors are 1, 2, 3, 6, 1/2, 3/2
 
jamesbond007

jamesbond007

Diamond Member
Dec 21, 2000
5,280
0
71
Thanks for the link! I'll check it out tonight after math class. ;)

Toastedlightly, I am still not too keen on programming it into my calculator...perhaps I'll ask my math professor for assistance. :D
 
C

Chloraseptic

Senior member
Jan 4, 2001
256
0
0
ti-86...

2nd func...

Hit Poly...

order = number of highest exponent

x^2 + 5x + 6

a2=1
a1=5
a0=6

hit solve...wa lah...

unless i'm missing what you're asking :)
 
jamesbond007

jamesbond007

Diamond Member
Dec 21, 2000
5,280
0
71
Originally posted by: Chloraseptic
ti-86...

2nd func...

Hit Poly...

order = number of highest exponent

x^2 + 5x + 6

a2=1
a1=5
a0=6

hit solve...wa lah...

unless i'm missing what you're asking :)
Click to expand...


WOW! All along I've had this access, but have never known about it...this works GREAT! Just one thing I have to keep in mind when entering negative numbers is that they come out to what X will equal, so if I have to fill in an equation, like (x-4)(x+1)=0, the X1 comes out as the opposite value. (comes out as positive 4 instead of negative) However, this kicks ass. :D

Thanks dude! You've saved me a lot of trouble!!!
 
D

duragezic

Lifer
Oct 11, 1999
11,234
4
81
Wish I had a factor function also ala TI-89 on my stupid 83+. I'm not very good with the algebra when dealing with 3, 4 or greater order with stuff like characteristic equations. Well the 83+ is pretty decent actually and I have some cool programs, cept one of 'em crashed when I gave it a really long derivative to take and it cleared the RAM so I lost a bunch, and my homemade link cable is torn all apart and I don't have much soldering skills to put one together.

It's super easy to write a quadratic formula program though. I had to do it again just recently cause the better Quad program I downloaded got lost in the RAM clear. Cept I don't know how to do one that can handle complex numbers. My simple one just errors out when theres a complex number solution, and more often than not my problems end up being complex damnit! The one I downloaded was able to... Anyway on the 83+ there's a Prompt cmd, but prolly not on the 86 so use Input to get the values of A,B,C then simply plug into formula and use a Display cmd to display results.
 
E

EyeMWing

Banned
Jun 13, 2003
15,670
1
0
Buy an 89. Worth every penny.

A TI-89 and a Mathematica license makes you FVCKING UNSTOPPABLE.

Edit: Now if anyone knows where I can get a prefab program to do all the statistics stuff on the TI-83, it would be greatly appreciated. I could've hand-coded it when I was in my stats class, but now I can't remember how to do it manually, and as such doing it on the calc is out.
 
G

Goosemaster

Lifer
Apr 10, 2001
48,775
3
81
USE THE HANDS THAT GOD GAVE YOU

oh wait...


USE THE HANDS THAT MONKEYS GAVE YOU



EDIT: oh, and synthetic division will take care of almost anything :evil: x 2
 
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