How to use the Algebra Solver on the TI-84 Plus

[@tessap6480]

Thank you! Very helpful. On the quadratic equations if you enter -1 and +1 for guesses you’ll get both answers without having to change your bounds.

[@danielweinreb6765]

Excellent resource for my SAT and ACT students!

[@OverOptimize]

You were right the first time...round it up to negative 1. Negative 1.000000000000001 is lower than ngative 1.

[@tduong29]

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.

[@tonmoyhasandhaka]

thanks a lot, sir

[@wolfgang15425]

Thank you soooooooooo much

[@connormattice4326]

confirmed, this works

[@gnibnikim]

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).

[@yurymetphosis5766]

You are correct. It is not necessary to change the bound. Simply change x= -3.999... to x=1 and solve it.

[@sam9242]

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.

[@yeety1208]

Yes the Casios are easy because all you have to do is type the equation out then press Solve and Enter

[@AndrewGulickTrueVitalityPlus]

Thanks, I wish they would give you a manual when you buy the calculator.

[@BraydenDarrell]

They do but it's either long or long gone. I can't remember which.

[@elisebb4457]

@@BraydenDarrell Both

[@BraydenDarrell]

@@elisebb4457 True! I probably just didn’t realize because it was so long ago

[@TheKarlMarx]

The one I got told me nothing

[@aashniii]

They do but it’s so long and wordy

[@PolRoquet]

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

[@aborne]

Good catch on that, Thank you!

[@zaneraymond9527]

How do you put in more than one variable ex. y or z?

[@rayna463]

How do you start a new equation? I can't figure out how to delete the previous one (the clear key doesn't seem to do it) please help

[@justiceminney8423]

mine doesn't let me plug in on both sides of the = symbol what do I do???

[@voguearts4389]

Your E1 is your left side of the equation and E2 is right side. Yes I know your comment is 3 years old

[@dominickfranklin6107]

@David Dez lmaoooo

[@johnchang1226]

I don't see the E1, ES boxes when I press B:solver. Why?

[@christinakennedy5063]

John Chang go to mode and make sure math print is selected instead of classic

[@johnchang1226]

Thks Christina! Appreciate. really love KZbin and the internet world, I get immediate response.

[@christinagonzales5994]

I’m stuck. So I get to solver, then your calculator give you 2 boxes (E1:,E2:) mine says eqn:0= Help please.

[@christinakennedy5063]

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

[@Coopsocrazy]

Is there a way you can download apps on to Calculator

[@aborne]

Yes, MrMane11, There is. I made a video for this too, and here it is: kzbin.info/www/bejne/mmKxZqB8rNBnh8U

[@hospitalqueen4047]

Thank you so very much!! This really helped me solve problems for my algebra course.

[@danielgamez4826]

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?

[@aborne]

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.

[@danielgamez4826]

@@aborne Alright. I understand now. Do you know if I can remove this design by default? However, thank you for your answer :)

[@aborne]

@@danielgamez4826 no, that’s how it is for the older models of the TI-84. They fixed it with the TI-84 Color and TI-84 CE models.

[@lobstahgirl]

My screen looks nothing like this. (I have a TI-84 Plus Silver Edition.) And when I hit "graph," a graph came up on the screen. Thanks anyway.

[@EricaLuvsYella]

What if I have the equations and three unknowns?

[@aborne]

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.

[@michellealvey80]

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?

[@aborne]

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.

[@danymak5]

where I could find the TI 84 plus simulator software that you are using in the video?

[@piggywings-hr3lv]

i can't find the PDF help please

[@louispalko691]

How do you get rid of old equations

[@Silver_refined]

+Louis palko I wondering the same thing. Did you ever find an answer?

[@aborne]

+Kim Tilliman See this video and press the "CLEAR" key. kzbin.info/www/bejne/e5qqqoiGe7ClpM0

[@matthewbrandt7186]

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.

[@aborne]

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...

[@doubledogdare610]

Before watching this video, I was told by teachers that I didn't have a solver. Now I will tell everyone. >:D

[@EndlessVortex-f5d]

They dont tell you that so you do more work

[@carlospiedra8640]

Does it have to be color edition?(ce)

[@aborne]

No, the algebra solver is available on all TI-84 calculators since 2006.

[@bruh-ox1pc]

What do you do if you have two variables

[@aborne]

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!

[@bruh-ox1pc]

@@aborne Oh okay thank you, is the plysolver under apps or math?

[@aborne]

Somome you know it’s under apps.

[@Dark-God986]

Can this give radical answers?

[@aborne]

Unfortunately, no.

[@itscolunga]

does it work for a ti 83?

[@winterberry3412]

So I could use this on the sat for system of equations?

[@winterberry3412]

This might be best for linear equations

[@aborne]

sganime96 sganime96, no the algebra solver doesn’t solve systems of equations, but the polysim2 tool does. It’s built into the TI-84.

[@marieSnowtruthjustice]

when I hit my x,t,0,n key, a capitol T comes up and I can't see an equation solver

[@salsadancer00]

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.

[@mrs.conscious]

is there a calculator that shows step by step?

[@aborne]

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.

[@user-ul3ew2su7m]

It can solve it and give 2 answers: go to apps> PlySmlt2> Polynomial root finder or simultaneous eqn solver

[@ChadC96]

99 thank you so much... I've been trying to figure that out for years

[@ynellirosas]

how can I edit the equation? when there are no error msgs

[@aubrey1008]

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.

[@aborne]

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"

[@brynmrsh]

This video's title should be "the Algebra Solver is wrong 50% of the time and that will get you an F if you write down the answers it gives you."

[@aborne]

Bryan, There is some truth to this. It is not a perfect tool and it's best to use it for very specific cases. Thank you for your comment.

[@hassanalsinan656]

Can I make a substitution using the ti 84? For example : x^2+1 | x={1,2}?

[@hassanalsinan656]

or x^2+1 | x=1?

[@aborne]

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.

[@hduongFGC]

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?

[@MattRevs]

the error at 3:55 was fixed in an update for the calculator (4.2)

[@aborne]

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 [e-mail] -Andy

[@twlson49]

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

[@thomaschavez616]

Bruh my class finished our algebra lesson about a week ago and I found this video right now

[@yeety1208]

Lol

[@bnegarza]

how does the calculator show infinite # of solutions

[@ryanwilliams9833]

How do you add fractions into the program

[@aborne]

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!

[@zupah5918]

yo rest in peace bro you saved us all

[@marliesveenstra3692]

I have the TI84 plus Ce-T and it still has the round off mistake

[@tinfoilbottle5943]

9:34 TI-84+ Tutorial

[@bridgettepierce1349]

Can you download MathWay on the TI-84 Plus CE?

[@connorlong5621]

bridgette pierce it is already installed, click math button, then scroll down on page to numeric solver

[@averagejoe9128]

Is the mathway app only on the TI-84 Plus CE?

[@TanyaAD138]

your website is gone???:(

[@aborne]

It is not gone- it's there. Perhaps you have something blocking you? I also just checked it for viruses, and it's clean.

[@justintime5231989]

I was just there try again www.andyborne.com/math

[@ramonaburkett2220]

Thank you for this.

[@MurrayMelander]

When I tried to go to your website to get the PDF file, my anti-malware software would not let me go there, saying it was not safe.

[@BamBam-fw5jm]

lmaoooo

[@BamBam-fw5jm]

just bypass it :)

[@aborne]

Murray Melander Sorry for that. I assure you, it's safe. If you wish, I will send you the PDF via email. Write me at [e-mail].

[@MurrayMelander]

Thank you. I'll write you straight away.

[@Indigovoxmusic]

When i press graph, it takes me to a graph.....hmmmm...something is definately not correct. I have a TI84 Plus C Silver Edition.

[@JuanesYEG]

Instead of pressing graph you can just go down. So go on E2: and press the down key arrow thing.

[@supermanrobin4426]

O.....M.....G!!!! I can't believe it's was that simple.

[@badralden77]

Thanks a lot perfect job!

[@rampingbros3146]

didnt work for me

[@stevendorsey4850]

By 7:02 I have become convinced that this teacher sounds like the actor that plays the original spider-man in the first 3 movies. XD

[@aborne]

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??

[@stevendorsey4850]

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. :)

[@Amanthaaa]

Does anyone know how I can solve x from 7,6*10^-10 = x*x/(0,100-x) on Texas calculator?

[@neverblinks00]

Minnesota Woot Woot! 26 and studying for my SAT relearning math and how to use a fancy calculator sucks.

[@aborne]

Sorry to hear you're having a challenging time with the tech. Good luck with your education program.

[@BamBam-fw5jm]

you CAN do it...don't give up

[@illusionclan5248]

Did you make the college

[@keepingeel7874]

If it makes my life easier it has done enough

[@sebastianlopez5307]

- it will find two solutions. * calculator finds just one solution. - it doesn’t have a solution * calculator finds a solution...

[@chloedraws1202]

Everytime i program my calculator it crashes

[@aborne]

+Chloe draws Sorry to hear that. Maybe describe what you mean in a little more detail?

[@kamaharima3701]

I actually got the 5 and not the -4.

[@candidastabile8319]

i did the SAME EXACT problem and instead of getting 1.00000001 i got 5.66666666666.....

[@francyluna5462]

+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.

[@atklm1]

x=x+1 means that the value of x grows by 1. Same as x++ :)

[@malducci]

atklm1 Except this isn't coding. But yeah, that's exactly how I saw it.

[@atklm1]

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. ;)

[@kendalwilliams5128]

Thank you!

[@winterberry3412]

I guess this would be good for estimating

[@yavuzturan6704]

I am waiting for you in graphic drawings for sharing your health

[@austinaylor]

we have to use plus c silver edition in 9th grade for ib!!

[@michaelmueller5211]

Ty. This helps me a lot! XD

[@kosterix123]

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

[@joetang8443]

thanks a lot.

[@UnitedPebbles]

Wow genius. See example, read instructions, practice instructions?

[@eddieteah3102]

Just got mine! # unboxing!!!

[@aborne]

Great! Enjoy!

[@MU19FC14]

my calculator do not have the 2 boxes. I just have the E1 not E2

[@sethborne9521]

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. :-(

[@roberteischen4170]

I'll just stick with Mathway app, I think. Plus, it's free. 😁

[@averagejoe9128]

Can’t you install mathway on a calculator?

[@averagejoe9128]

@mohammed mohaimen can you show me how too install mathway on my calculator

[@yavuzturan6704]

Emeğinize sağlık paylaşım için teşekkürler.Grafik çizimleri içinde bekliyorum.Teşekkürler.

[@juliebasak6323]

U need more examples

[@anthonyx4891]

He is lying everyone. The calculator is able to do it.

[@salsadancer00]

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.

[@malducci]

Anthony X He's not lying. He just didn't set the range wide enough.

[@rbca01]

thank you Mr. Borne!

[@aborne]

You are very welcome. Thanks for watching.

[@TonyDaExpert]

TI-Nspire CAS ftw

[@SnakeDoctor303]

Why does my solver not look like that?

[@aborne]

It is probably due to your calculator having a different version of the OS. Is your calculator an older model or a newer one?

[@stevenscottoddballz]

[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?