ad_ty_su81bb Veteran 274 Posts user info edit post |
Anyone know how to do quadratic eqns (x^2 + x + 3) in a TI 83+? If so, please let me know. I'm trying to cut down time in doing the quadratic eqn. Thanks. 9/20/2005 9:56:51 PM |
qntmfred retired 40726 Posts user info edit post |
by do quadratic equations i take it you mean solve quadratic equations? in that case, i'd recommend using the solve function.
if memory serves correct, you would do something like solve(x^2+x+3,x)
[Edited on September 20, 2005 at 10:05 PM. Reason : expression is assumed equal to zero - solve(expression,variable,guess[,{lower,upper}])]9/20/2005 10:01:57 PM |
Grandmaster All American 10829 Posts user info edit post |
don't you have to use matrices with the 83+? 9/20/2005 10:02:02 PM |
Shivan Bird Football time 11094 Posts user info edit post |
Write a quick program. 9/20/2005 10:03:55 PM |
joe17669 All American 22728 Posts user info edit post |
9/20/2005 10:37:05 PM |
JonHGuth Suspended 39171 Posts user info edit post |
PROGRAM: QUADTRATI : Disp "ax^2+bx+c=0" : Disp "ENTER VALUES" : Prompt A : Prompt B : Prompt C : Disp (-B+(B^2-4*A*C)^.5)/(2*A) : Disp (-B-(B^2-4*A*C)^.5)/(2*A)
[Edited on September 20, 2005 at 11:31 PM. Reason : or something like that, i cant remember the language]9/20/2005 11:30:44 PM |
Aficionado Suspended 22518 Posts user info edit post |
gg with your TI-Basic programming 9/20/2005 11:31:39 PM |
joe17669 All American 22728 Posts user info edit post |
^^ almost 29k! 9/20/2005 11:38:49 PM |
ad_ty_su81bb Veteran 274 Posts user info edit post |
Thanks for the suggestions. I'm spending too much time trying to figure this out instead of studying. 9/20/2005 11:40:41 PM |
HEAVYCRAIG Veteran 200 Posts user info edit post |
I thought only the 89's and up had the solve function?? 9/21/2005 12:06:29 PM |
psnarula All American 1540 Posts user info edit post |
i have the T-86 and it has a Solver... 9/21/2005 12:15:12 PM |
Schmitty All American 982 Posts user info edit post |
not sure about the 83+, but the 86 has a 'poly' function that solves any order polynomial. you just plug in the coefficients. so you could use that or the solver. 'poly' is the 2nd function on the 'prgm' button on my 86 9/21/2005 4:37:00 PM |
69 Suspended 15861 Posts user info edit post |
i got the new 89 with usb, so i can do my programing on my computer, and i have the entire final fantasy 1 on there now, no more tank wars and nibbles for me 9/21/2005 6:19:27 PM |
Wraith All American 27257 Posts user info edit post |
Copy the equation into the graph/plot section and then find hit the button the right of zoom (can't remember what it is called) and hit roots. It will give you the answers if they are real. If they are imaginary, you are out of luck. 9/21/2005 6:58:57 PM |