Andrew, the calculator does give you both answer, heres how to get it. X (without the box) is where the calculator wants you to guess the answer. If you want the positive answer to the quation, you have to enter a positive number for X, to make it simple just enter in 1. Then "ALPHA", "ENTER" will give you the X (with the box) = the positive answer. So if you want the negative answer to for the equation, enter in -1 to guess for X(without the box), then "ALPHA", "ENTER" will give you the negative answer. DO NOT CHANGE THE BOUND.
Thank, this is helpful. I use Casios where this is amazingly easy. I am helping someone with a Ti and we never would have figured this out. I never see "round off errors" on my calculator.
6:35 The Bad Guess error is just saying that you used a guess that was not in the bounds of the solutions you set in the calculator. if you were to clear the number in the X variable and put in 1 you should get 5 ( 4.99999999999 because of the round off error).
minute 5:30, the X you have is the last response which is negative and is not inside the new boundaries you have defined and it is the number in which the calculator starts guessing, when the boundaries are changed the X has to be inside the boundaries
marie Snow You have to change your mode and make sure that 'FUNC' is selected. You were in the parametric function mode and you need to be basic function mode.
What's the point that TI created this function and left a limitation like that? The scary part is: many colleges now are starting to make that transition by teaching students to solve a Quadratic on these calculators. Many of the students are either "first time" or "first time after a ... long time" learning to do this. Teaching them to solve a Quadratic using the Solver (as the primary method over the traditional method "solving by hand") where the calculator can only give 1 solution is going to create a belief in students that "a Quadratic only one solution". I already had too many students coming to my office hour seeking for help and when I asked "how did you get that answer?" (obviously an error), the only answer I heard "because my calculator said so". Your presentation is really good, what I'm looking for is: does anybody actually know how to overcome these limitations of the calculator?
The reason it didn't find the second solution when you were looking for the positive 5 to go with the -4 on your first example is on the x= line you left the -3.999 you have to delete the negative sign to make a positive guess. Then it will find both the positive and negative solutions.
Matthew. Thanks for the comment. Tried that, and I just tried it with the newer TI-84 CE with OS 5.1 and, sadly, it still sucks as searching within a pos/neg bound. The Polynomial Root finder can solve this just fine, so go figure...
The closer you guess in the x= box the more likely you won't have round off errors like -3.999999. For example put in x=-2 and press solve and you will get x = -4
Hello, I am just learning to use my TI 84 Plus CE. When I follow these steps with both problems my result always shows x=10. Is there something different with the CE Plus? Do I need to change my mode?
Michelle Blades Thanks for asking. Yes, the newer TI-84 Plus CE has slightly improved the round off error thing. Instead of -3.99999.. it correctly produces a -4. However, every other example of where I show the limitations of the solver look like they are the same. Thanks for pointing that out.
Christina Gonzales chances are u are using Ti-83 plus or maybe 84 instead of 84 plus. yours u put in the equation after the equal sign. Watch the video from 11:00 n it shows what to do when u get eqn:0
The algebra solver can’t handle that, however the TI-84 has a app called PolySim which is a polynomial simultaneous equation solver that will handle three equations with three unknowns.
I am having some trouble: 5(x+3) +2(1-x)=14 (1) First of all I have a new version of the TI84 plus called the CE. Somehow a key that make lower case letters which are much harder to read. How do I go back to upper case letters? (2) Also, I got the answer: -3.78787878 (3) When I put the Alpha key on the flashing minus sign, I get a syntax error. Please tell me what I did wrong.
Hi Fred. I'm not sure, make sure the whole part: 5(x + 3) + 2(1 - x) should be in the box "E1" and only the 14 should be in "E2" The answer solves to x = -1. I did this on my own TI-84 CE. Not sure what you mean by lower case letters, but you need to use an upper case "X" from the key marked "X,T,θ,n"
MattRevs Matt, can you give me a little more info on that? The last update to the OS to the calculator was Jan 2011. I would LOVE fo them to fix these pesky errors. Please write me at abornemath@gmail.com -Andy
There is no calculator that I know of that shows step by step, however the website WolframAlpha shows step by step with a subscription, and it’s not very expensive.
Ryan Williams, The built in MathType functionality for fractions unfortunately does not work with the Solver on the TI-84 SE, but you can use fractions. Just put your fraction into parenthesis like this: (5/7) using the division key, and it will work. The answer may be a decimal (yuck) but you can convert many real numbers back into fraction form using the >FRAC function under the MATH key. Good luck!
I see this video is old but I'll ask anyway, maybe someone can help me. My t 84 plus has a set 0= when I put it in equation mode. Unfortunately, there is no way I can delete that first part (0=) and it keeps nullifying every equation I do. Does someone know how to fix it?
Hi. Yes, I know your problem. Its not a bug, its just poor design from TI. The idea is that you solve an equation in terms of zero. For example, if you want to solve 5x - 3 = 7, you have to first do the work of making it equal to zero, so the equation will look like this: 5x - 10 = 0. To entered into the calculator, 0= 5x- 10, then hit solve, and it will tell you the value of x.
+Candida Stabile I did too at first because I do to get the same screen with two boxes. Mine just says 0= ... So, what I did was put all of the equation on one side, I inputed 5(x+3)+2(1-x)-14 and after I calculated and pressed A enter it gave me -1 as an answer.
Hassan Alsinan , For your first question, no, the calculator will not accept a list x=(1,2) for the input variable. For the second, if you wish to test x^2 + 1 | x = 1, you can. Here's how: store the value '1' into 'x', using the STO key, then type in x^2 + 1, and the calculator will compute the answer. The output will be 2.
Somome you know the Algebra solver is very limited, it only handles a single variable. However, if you are talking about solving two variable simultaneous equations, it has a different app called PlySmlt2 that solves simultaneous equations using 2 or more variables!
Ha ha. :-) Yeah, in teacher school we practice how to speak like actor Tobey Maguire. In real life, I look like the dude from the office. But hey, if you made it to seven minutes, then I guess this video wasn't so bad, right??
Lol. I actually liked Toby Maquire's performances in those three movies. He wasn't hte comic book spiderman, but there were some amazing scenes in those three movies, and he wasn't bad. Your video was useful too, because I didn't even know there was an algebra solver on my calculator I recently got. I"m using a graphing calculator for the first time in my Pre-Calculus online class, and I'll admit, the only thing I'm put off by is how I can't simplify radicals wihtout a special downloaded program like I could on an older calculator I have. Other than that, my calculator works great. :)
malducci Well, coding or not that is how any working computer sees it when you tell it that x=x+1. And we like the other smart people see it also that way. ;)
Hi Ana C. I know what you mean. I'm very sorry this video was not helpful; unfortunately, the instructions are a little different for the TI-84 Plus Color. The equation can only be set to zero on the older model calculator. For example, to solve 2x = 8, you need to input the equation as 2x - 8 = 0. Not helpful, but that's how it is. :-(
very nice style you have! But what is this Graph-alpha-enter mantra shit all the time? Whats wrong with a simple solve button. And that ridiculous -1.99999 where all the other numbers are exact? lame. btw instead of going down 9 times you can go up 1 time i guess
Anthony X He's not lying. He's mistaken and there's a big difference. Lying usually implies intent to deceive. The calculator can, indeed, find both roots but he needs to make a better guess. The error message was trying to help but he, unfortunately, ignored it.
[82.17412768->c c/SIN54 = 36/SINA (36*SIN(54)/c) This gives me the answer of .354425567 Is there something & can add to the equation for the calculator to give the answer in degrees?
