TI-Nspire CAS for Algebra - Expand, Factor, and First Time Use
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- Опубликовано: 14 окт 2024
- Some things to do your first day with your new TI-Nspire CAS.
We cover:
Starting a new document.
Using the fraction template.
How to move between spots in templates.
How to get approximate values instead of exact.
Using parentheses and getting out of them.
Menu, 3, 3 for expanding pretty much anything.
Menu, 3, 2 for factoring.
Copying and using a previous answer.
Using comdenom to get a common denominator.
How do u change standard forms to slope form... vise versa?
My Nspire calculator doesnt have all those tools it only shows 3 inside Algebra
Does that mean I need to get a new calculator?
Hi very interesting. Is possible make BODE's Diagrams with This calculator? Thanks for answer!!
I'm not exactly sure what BODEs are...
Im stunned, with
ln(1-x^2) - ln(1-x)
a HP Prime instantly answers ln(1+x)
But I cant find with a TI Nspire how to do.
Does an instruction in the CAS vocabulary exist ?
It is somewhat boring that such a calculator doesnt find this elementary simplification that a teenager will find at the first look.
Thank you very much il you can tell me the trick.
Sincerely yours, Milos
PS sorry for the english, I'm french
Hard to say. I couldn't really tease it out with manually writing it as ln((1-x^2)/(1-x)) and then it did simplify but warned about domain. So it might be a domain issue that the Nspire doesn't want to deal with since ln(1-x^2) - ln(1-x) doesn't equal ln(1+x) without messing with domains? Sometimes the Nspire just doesn't do what one would expect.
There's certainly a group that prefers the HP Prime. I don't own one and have never had a chance to use one. I requested a copy to start making videos with it at some point but never heard back...
@@turksvids Cant I do ln(1-x^2) = ln((1+x)(1-x)) = ln(1+x) + ln(1-x) to avoid this issue about the domain ?
In the problem, aside ln(1+x), x*ln(x) is mentioned too but Im unsure as there is no * nor parenthesis, it can be a mispelling and I will probe.
If you are in UK I can borrow you a HP Prime several monthes. This has no true RPN and is not friendly to use, but is faster and can give 500! btw.. unfortunately sometimes it doesnt solve a polynomial equation (Thomson's formula, to get C or L). But like many HP, the quality is good even if built in Asia, and the screen is sensitive.
My mail if you want try the HP (I have a couple of prime) bilik.miloslav@wanadoo.fr
Cordially
Milos
I tried, if I replace x with x*ln(x), the functions arent the same even graphically.
I'm having problems with ( find the product)
6x sqaured ( 5x sqaured plus 9x sqaured minus 6x plus 6 parentheses) with nsolve but its giving me error and that I'm missing something?
I'm confused
I'm struggling to get exact answers from expanding higher degree polynomials. Is there any way to get that working on the CAS?
Can you give me an example of a type of problem you might want to do?
@@turksvids
Sure.
I'm using the expand function on an equation that looks like this:
ax^4 + bx^3 + cx^2 + dx + e
I can't get the exact values for a, b, c d, or e. I've been looking around, but I can't find it anywhere. Do I just have to settle for decimals?
Thanks for the help.
Hi, if you mean that you're trying to factor something with that form then there's a really good chance that the best you can get is decimals. The odds of that type of polynomial factoring over the integers (giving nice factors) is very low. You can also take a look at the x-intercepts of the graph to see if you should be getting "nice" factors or not. I hope this helps...not sure if it does...
@@turksvids
Ah, thank you. I thought it may be impossible to get any nice fractions or surds, I just wanted to make sure (because obviously, we want to always be using precise values.)
Thank you for the help.
I just bought one but I dont have the solve command i only have numerical solve, solve system on linear equation, and polynomial tools PLS help me get the solve command
this is definitely not the answer you're looking for, but if you really want the solve command you should return the calculator you bought and buy the one that says CAS in the name and description. sorry i can't be more helpful!
I'd like to know how to completely simplify expressions I input 9x^2y-3xy hoping to get 3xy(x-1), but it outputs 3(3x^2y-xy). I also wanna know how to get x√x when I write √x^3
For the first example you give, you need to use the multiplication symbol between the x and y or the calculator thinks the variable is xy instead of two different variables. For the second, I don’t think you can force radical notation over rational exponents because rational exponents are more commonly useful above algebra. Hope this helps!
i put the same first expand question, that being (x-3)(x+5) and i got {-7., 9., 425., -15). Any reason why this happened and why i didn't get x^2+2x-15?
I actually cannot imagine what could make that happen. Do you have something stored as x? (That's a possibility...but it still shouldn't give you a list of values when you use expand.) If you figure it out, I'd love to hear what the issue was. Does it do that for other things you try to expand as well?
Anyone knows if the Nspire can add with commas?
Ex. 2,446,345 + 23,345
I get error.
Thank you in advance.
The Nspire will not let you put in commas for place-value. They're not necessary though. If you want to do 1,152 + 3,222 you just omit the commas and do 1152+3222. Hope this helps!
@@turksvids Dear all , how can I solve with TI inspire CX CAS II the following problem : f(x,y)=x-2y sub x≥0
,y≤0
,x-y≤1
,y ≤2
. In order to find if exists the the point of max global for the problem.
I can't sort out how to write a 2 variables function in TI inspire CX CAS II btw
thanks in advance
@@wall1909 Hi! Check out this playlist, something in there might help: ruclips.net/p/PL6iwkLfBjZiwkzCW4zQSumGbYUF_mHcq7
Under menu algebra 4.Zeros could you do a video on this. And all others. Solve you did and expand factor you should have a vid one each one command
I noted you skiped a few menu items
yeah, i mostly only make videos for things my students need to use so a bunch of commands get skipped over. it's a fair point though.
I was trying to factor a quadratic equation on my calculator and it keeps saying "variable is not defined". What am I doing wrong? I am using the Ti-nspire CX, does that make a difference?
Unfortunately the CX does not factor algebraic expressions (it will give prime factorizations of numbers). That's the issue if you definitely don't have a CAS.
thankyou!!
thanks! really helpful
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