Glad you found it helpful and that let me know. Even if you are an algebraic wizard, it can still be a time saver - and there are some situations where normal algebra is not enough.
Can you give me an example of what you mean? It depends if you are talking about something like y=3x-5 or if you have two different equations like 2x+y=7 and 3x-2y=11.
Is it possible to use this with a polynomial ? for example x^2-3x-10. I know you can solve this using Setup, A, 2 , 2. When I try it will only give me x=5, but how can i also make it give me x= -2
This video (ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-fcKfZFosaTo.html) shows you how to find the roots (solutions) to a quadratic equation which is what you are asking for.
I think most of the time you get away with it, but it is a bad habit. For example, in normal mode, if you use subtract (minus) key to enter -6, the calculator will assume you want "Ans-6" (the previous result minus 6). If you instead use the (more proper) "(-) negative" key, the calculator will simply assume you want "-6". Also, if you switch to a different brand of calculator, you may find it less-tolerant of using subtract key in place of negative key.
say i have a complex equation like (9+x)(81-x^2)=864. How do i solve that, but without using the polynomial function? Since using the polynomial function, i would have to first expand the equation which I'm too lazy to do.
We know this is a 3rd degree polynomial which means it will have 3 roots (since you have a 1st deg polynomial times a 2nd deg polynomial). Since the solver is using "guess and check" method, it is going to tend to find a root that is closest to your initial guess. You will have no trouble finding ONE of the three roots. The difficulty is going to be finding the other two. You can play around with the initial x guess and see what happens. With your particular example, which has a root x=-15 and a double root x=3, I cannot get my TI-36X Pro to find the x=3 double root. It will only find the x=-15, unless I happen to put in a guess like x=3.01. Even w/ a starting guess of x=4 causes the calculator to find the x=-15 root. You may have to FOIL, my friend, and use the root finder functionality.
@scott Collins, my HP 48GX can't find exactly 3 with the Solve, it gives an "Extremum" (which it is also) = 2.99998192115. Guess=2. Prime gives also something like 2.999985. In CAS, solve find it (them!) properly. DM42 ("high precision") find and displays an Extremum "3" but shows many 9 when Show is invoked. Cleaner though. DM15L find 2.99991, starting from 2 as guess (same guess than calculators above). Useless but fun ;-) I think the Solver is far from 3, even with the Prime, strange enough.
Negative key is for making coefficients negative. Minus button is for subtraction. There are subtle differences between their behavior, so it is good to do your best to use each one for its intended purpose.
do i need some special set up for this ? because i tryna solve one equation and the answer came out as x=0 when i type 1 and press equal again the whole page disappear 😭 this happen to my friend’s too
What eq are you trying to solve? My best guess is that the calculator is having trouble finding the solution and the screen goes blank while it is trying. How about trying something simple and see if you can get it to work ---- 3*x=18
@@rokopavic644 STRANGE. I have no idea why it is not working the same as mine. One thing to check would be to confirm that you are in the normal (not complex) mode --> Press "MENU" button and select option 1.
This was really helpful thank you, but i still have a problem. When solving an equation like x(x-2)(x+1)(x+2)=24 i only get 1 answer when there should be 4. Could you help in any way?
Glad it was helpful. Yes, you've hit on the problem w using an iterative solver - it only finds the first answer it stumbles across. You can try starting w a different initial guess -- like start with x=9999 and see what it finds. Then try x=-9999 and see. The only way I know to actually find the three roots w certainty would be to rearrange the equation into ax^3+bx^2+cx+d=0 but that requires a lot of tedious expansion.
Glad it was helpful to you, Master Potato. Yes, having access to the world's knowledge frequently makes it difficult to find what you actually are looking for!
You can use the initial guess for x to increase the likelihood of it finding the other answer. Alternatively, you can use the quadratic solver to find both roots.
Hello. Watch this video: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-FbDysTAuSjc.html One thing you will need to do is to "move" the constant to the other side of the equal sign. In other words, you first need to reorganize the equations to be: 5x - 9y = -3 and 3x - 10y = -9 . The constant always needs to be isolated.
Is this video helpful? ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-vrRmbHP9zRA.html I am not familiar with what SHARP "Dal solver" is. Is it the same kind used on the calculator shown in the video link I shared?
It depends. If it's a relatively simple equation, then you probably do not need to supply a guess for x -- you can likely just use what is already stored in x and go from there. But, there are situations (e.g. trig equations, logarithms, exponentials) where the calculator is unable to find an answer without an initial guess that at least gets it started in the right ballpark. In the end, as long as the calculator says "L-R = 0" below the answer it gives, you do not need to do anything different -- it found a correct solution.
@@DiraLutfiya You’ll probably need to ask a friend or teacher for help. Without seeing the steps you are doing I do not have a practical way to help. Sorry.
Try hitting the = key a second time. You'll know it worked b/c you will see "L-R = 0" at the bottom line on the display. If you are just seeing the "x=0" in black highlight, you need to hit = key again.
Thanks for the suggestion, John. I may do a video on the fx-991CW, but I doubt I am going to get to the fx-83GTX. There are just so many slightly-different models made by Casio for different markets. Plus, I am not doing many new videos these days. Regardless, I do appreciate you leaving a suggestion -- it is helpful!
Go to 1:41 in the video. Notice that after it solves you will have "L-R= 0" as the last line on the display. If you instead are seeing "x=5" in black highlight, then you need to hit = (EQUALS) again (maybe even two times). You'll get the hang of it. I really doubt anything is wrong w/ your calculator -- this solver is not intuitive and confuses a lot of people.
@@sumeadhms3482 The calculator will display whatever value is stored in x at the time. In other words, I probably ran a previous calculation where the solver found x=46.6. That value stays in memory until it is replaced with a new value (even when the calculator is powered off).
What model of calculator do you have? Does it have the "x" button? One thought is that you have it in imaginary mode or some mode that is dis-allowing you to use the x. I'm not sure.
Double check that you are entering it correctly and following the same steps. My best guess is that you are stopping before you get to the screen that gives value for x along with "L-R=0" to let you know it found an "exact" solution.
@@scottcollins7513 hi ik I'm be late but i also experiencing the same problem. If i don't guess the value of x i get 2 but if i choose to put 1 to guess before the real answer i end up with 2.6
Potentially, but it is like using a wrench to pound in a nail -- it might work, but it is not the tool for the job. When dealing w/ quadratic equations, you would be better served by the poly solver --> ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-vqQE3sy0_H8.html
This video takes a deep dive -- it is 4 years old, so you may want to double check to make sure nothing has changed: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-FeN5Y9OOOIQ.html Based on the video, the 991EX would be allowed on the GCSE.
I'm literally doing the same exact thing. I'm making a one variable equation, pressing shift, then calc, but it's showing a variable error? Is there a reason for this. Someone please help
@@alexmisra6690 Ok, yes -- very similar, but on that calculator you have to tell it what variable to solve for if you do not use X. Let's say you want to solve 3*A=37; you will have to type in 3*A=37,A (the comma "A" tells the calculator it is solving for A). Seems easier to just use X.
The better the initial guess you supply to the calculator, the quicker it can typically find the correct answer. But, with simple algebra equations like the one in my example, it is going to quickly find the correct answer regardless of your initial guess. The more complex the equation, the more helpful the initial guess. It helps if you know that you want a postive answer vs a negative answer. Or a very small number (like 0.01) vs a very large number (like 200,000).
It is giving you the correct answer (not sure why you have a zero in front of the 2, but it's technically still the correct answer). The L-R=0 is just the calculator telling you that it found an answer where the difference between the Left and Right sides of the equation are equal -- in other words it found an answer.
I'm not sure what you mean, Eduardo. Are you asking if it can handle multi-step macros? Or let you save equations/expressions for future use? In my mind it would not matter b/c as soon as the computer is turned off, it "forgets" everything (other than the values stored in variables) that I'm aware of.
Make sure you are putting a NEGATIVE sign in front of the 3 coefficient on the Right-hand side. I think you are likely using POSITIVE 3 and that is what is causing you to get x=8.
Not exactly sure what scenario you are picturing, but it will solve an equation with multiple variables like "3y=2x-10". You will have to provide a value for x and then tell the calculator to solve for y and it will. Or you can input the value for y and have it solve for x. If you are asking about something different, let me know and I will try to get you an answer. Take care, Xavier.
@@xavierdouglas2601 It will do that with ease. I typed it in exactly as you have shown, gave it a starting guess of x=11 (it is rare that this even matters), and had the answer in less than 1 second I would say.
@@xavierdouglas2601 Press the = sign one more time and it will probably do the trick. If not, rewatch what I'm doing and be careful to follow every step. I'm pretty sure you are doing something wrong (unless the solution to your equation is actually x=0).
That is the correct answer to the equation. If it is giving this to you at the very beginning of the process (see 1:22 in the video here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-nHFTNqgnCCw.html) then it is simply the last value the calculator had for x (from a previous equation or whatever). Hope this helps.
The M symbol just means you have something stored in the memory register and does not impact the solver. I think you just need to hit equal button again to get the solver to give you an answer.
You are not alone. There must be something different about some calculators. My best advice is to have you hit the = key an additional time and see if that works.
When people get x=0 (assuming the answer should be something else), they are failing to hit the = sign a second time to get the calculator to actually find the answer. Try hitting that = sign again. Hope it works for you.
I'm guessing you need to hit the equals key one more time to get the calculator to solve -- hard to tell since I'm not sure precisely what you are describing. Hope this helps, Barbie.
@@scottcollins7513 thank you for the response. It says x=0. It is always x=0. I just did what you did. But the answer of my calculator is 0. I tried the other equation but it says 0 as well. Can u tell me what's the problem?
@@barbievargas2886 Glad to hear you figured it out! I was pretty sure you just needed to press equals key again -- it is admittedly confusing. It is very hard to help w/out being able to actually see the screen.
My best guess is that you need to hit = key a second time. You will know it has found the answer when you see “L-R=“ displayed on the bottom line of the display. If your x=46,776 is highlighted in black, then it has not yet found an answer.
@@davidengel3309 I see. The calculator will always display the current value of x stored in the calculator. I evidently had done some other problem where the solution was 46….
