Can the TI-89 Titanium Solve Symbolic Equations and Compute Specific Values?

[Saladsamurai]

It says (the TI site) that the TI-89 Titanium can manipulate symbolically and what not. Well I just have 2 quick questions:

let's say I punch in some equation like $$\frac{dE}{dt}=\dot{Q}-\dot{W}+\sum_i\dot{m_i}h_i-\sum_e\dot{m_e}h_e$$

1.) I could somehow select W (for example) and the calculator would know to solve the expression symbolically for W?

2.) I could then input numerical values for all of the other variables and it would give me the numerical value of W?

Thanks!

 

[Saladsamurai]

Anyone have this calculator?

 

[Saladsamurai]

Seriously, answer me. Please So I can buy it for myself for X-mass.

 

[rootX]

I don't know but I think you are asking for way too much ...

I wouldn't rely on calculators for these things

but I see that it does solve DEs
http://www.rowan.edu/open/depts/math/HASSEN/ODE/TI89_for_ODE.pdf

and this says that it can solve for one variable
http://ti-89.org/forums/post-97.html

then there are always limitations.. these equations need to be dumb simple

(I only used it in grade 12 only.. now I have casio fx. It do many conversions and has constant values and solve simple algebraic, quadratic, cubic equations, etc, .. and had it for about 15$)

 

[Saladsamurai]

Asking way too much? All I want to know is if I punch in a+b+c=d can the calculator return that a=d-b-c

and if d=1
b=1/2
c=1/2

Can I input those and have it tell me that a=0.

I don't think that is too much... or is it? I have never rellied on calculators to do algebra. But as an engineer entering his junior year, I am sick of doing algebra

 

[rootX]

Asking way too much? All I want to know is if I punch in a+b+c=d can the calculator return that a=d-b-c

and if d=1
b=1/2
c=1/2

Can I input those and have it tell me that a=0.

yep, I think so .. see that thread:

"you can use solve() function to do it (in algebra menu), put the equation first, then a comma, the the varible you want to isolate. in your example, it would be: solve(x+y=z,x) and it will return you x=z-y. Similarly, if you want isolate y, put: solve(x+y=z,y) and it will return you y=z-x"

I thought you wanted something like
df/dt = Q(t) + W(t) + sigma (f(t)) + sigma (z(t))

I been using casio for my engineering ...

I would recommend going through all the TI manual:
http://education.ti.com/educationportal/sites/US/productDetail/us_ti89ti.html?bid=6

and comparing it to what you will be doing.. and if your TI calculator would be allowed in the finals.

 

[Saladsamurai]

Cools! thanks for the links!

 

[asdfggfdsa]

Seriously, answer me. Please So I can buy it for myself for X-mass.

Yes, I own one (for ~4 years now), and yes, it will do what you want (use the solve, nsolve, and desolve functions). Also, if you get it, download http://www.ibiblio.org/technicalc/packages/mathtools/main.htm" and install it on your ti.

Merry schnappsmas.

 

[Saladsamurai]

Yes, I own one (for ~4 years now), and yes, it will do what you want (use the solve, nsolve, and desolve functions). Also, if you get it, download http://www.ibiblio.org/technicalc/packages/mathtools/main.htm" and install it on your ti.

Merry schnappsmas.

Nice, thanks for the tip!