ti-89 titanium question

Test Preparation
1

<p>hi everyone,
on my ti-89 i seem to have somehow set the variables equal to constants.</p>

<p>for example, when trying to factor 3x^2+5x, i get 100 as an answer, rather than x (3x+5). (no i dont rely on the calculator for things like that, i just made that example up to explain.)</p>

<p>that is because x is somehow set to 5. actually if i just type x in (not factor x or anything like that...literally just x), and press "enter", i get 5. if i put in y, i get 7. z i get 4, and t i get 3.</p>

<p>im not sure how i did this, but if anyone can tell me how to undo it, it would be much appreciated. And if the only way you can come up with is to completely delete the calculator's memory, that would be fine because i dont have any programs on it. (if that would work.)</p>

<p>Thank you</p>

2

<p>2nd --> Var-Link (minus key)
go down the list and press F4 to check any variables
then press F1 --> delete</p>

<p>i'm new to the calculator so there might be other ways to do it.</p>

3

<p>[2nd]
[f1]
<clear a-z=""></clear></p>

<p>EDIT: The other guy beat me to it, apparently, but I think my way is faster... unless there were some variables you wanted to save.. then his way would be good for deleting only certain variables.</p>

4

<p>since that question is answered, i have another one regarding the TI-89. </p>

<p>When i am in the "y=" menu to graph something, I was working on continuity in calc today and tried to put in something like... "y= x-2 | 1<x<3" (just an example), but it kept coming out at "syntax error." I tried doing parenthesis, which didnt work either. what is going on? Regular inequalities like.. "x<2" work just fine, its the "x is between" inequalities that give a syntax error.</p>

5

<p>sorry i have no idea how to help you, but ill bump your question by thanking everyone else for helping</p>

6

<p>yea, the range "1<x<3" doesnt work. you have to input: "1<x and x<3"</p>

<p>im pretty sure that would work. if it doesnt, then i have no idea.</p>

7

<p>thanks! it ended up working, but I hate how you can do it on TI-83 but not TI-89...</p>

8

<p>hey everyone, sorry but...im incompetent.</p>

<p>i have another question now, this one is about programming.</p>

<p>i wrote a program to help me quickly solve for the distance between a line and a point. the formula is: abs(Ax+By+c)/(a^2+b^2)^.5=d, where the line is of the form ax+by+c=0 and the point is of the form (x,y)</p>

<p>the program i am trying to use is from the barrons math 2c book, but it is made for the ti-83. still, i do not see why it does not work on the 89.</p>

<p>so here is the program:
:dpl()---<that is="" just="" the="" name="" :prgm="" :prompt="" x="" y="" a="" b="" c="" :abs(ax+by+c)="" (a^2+b^2)^.5-="">d
:disp "distance="
:disp d
:endprgm</that></p>

<p>when i use this program with random digits (for purposes of this example), the answer given is :</p>

<p>(abs(ax+by+9) * (37)^.50)/37</p>

<p>the program always leaves those first 4 constants as the letters, rather than plugging in the values i give
any suggestions?</p>

9

<p>I think I know why you're having this problem. The calculator is reading "ax" and "by" as individual variables instead of as "a times x" and "b times y," which is how you intend it. Try to insert a multiplication sign in between the "a" and the "x" and between the "b" and the "y." Let me know if that helps.</p>

10

<p>perfect!</p>

<p>thank you. and wow, these problems all seem so simple once i have the right answer...stupid hindsight</p>

<p>thanks</p>

11

<p>is it possible to plug in two or more variables into an equation at one time?</p>

12

<p>firebird12637 </p>

<p>it works with os 3.10</p>

13

<p>Is there any way I can use the solve() function and have it only return solutions which are integers?</p>

<p>Could there be a program to do so? Or how could I write one?</p>

<p>Thanks!!</p>

14

<p>Hi,
Is there a way to find the period in radians of a function from the graph?I am talking about a more complicated function where the period is not straight forward.
Thanks !</p>

15

<p>anyone?.......</p>

16

<p>Where is the cheapest place to get a new TI-89 Titanium? Ebay?</p>

17

<p>ehh...I thought they don't let you use a graphic calculator where you can program stuff into?</p>

<p>'cause some people program like vocab, math hints or whatever into it. </p>

<p>TI-89 Titanium = not allowed
TI-83 plus = allowed</p>

18

<p>comem, all graphing calculators are allowed on the SAT/PSAT/APs/SAT2s if that's what you're talking about. It's the ACT that doesn't allow TI89s. And calculators are only allowed on the math portions anyway so having vocab lists does nothing unless you don't understand a word on the math portion or something....</p>

19

<p>^or you could finish the math section early and quietly move back to the verbal section but that is illegal so . . but you could do that. ;)</p>

20

<p>yeah ;/ </p>

<p>I don't think TI-89 should be allowed. You can still program math hints into it!</p>