joao, do you mean using Basic to display a linear cartesian representation of an equation?
In that case, yes it is possible but it would be slow, and impractical.

Do you mean like storing y1=x^2-1 from a program? Yes, you can use strings. so "x^2-1"->str1:dispgraph would show the graph. If you do not want to show the graph, you can just do solve(y1,x,1). solve( is under [math] and has the syntax solve(equation,variable,guess).

This is a better answer to your question.
I need to anticipate the experience levels of newbs..

Ah, I see. You cannot display data to the screen while the program is running. You cannot directly assign an equation to f1, for example, but you can set f1=myfunc, and in the program set x^2-1-> myfunc. However, you cannot then access f1. If you just want to find the zeros, then the solve( for CAS or the nsolve( for non-CAS is what you are looking for.

If finding zeroes is your only goal then you can just do "nSolve(x^2+3x+4 = 0, x)" for example (without the quotes). If you want to be able to enter arbitrary values as well do the following (assuming you are on a touchpad / CX):
Go to doc>Insert>Program Editor>New, enter a name and select "Function" as the type. Press ok, you will see the following:
Func name()=

EndFunc
Now change it to the following (replacing the equation with whatever your function is):
Func name(x)=
x^2+3x
EndFunc
You can also add more variables to it, but that will unable you to plot it. To use it you simply call name(3) for example. To solve for zeroes use "nSolve(name(x)10, x)" on non-CAS or "solve(name(x)=0,x)" on CAS.

I suggest using jacobly's emu for programming using your Nspire. Because Nspire basic is pretty much nonsense.

TI-Nspire BASIC is actually extremely well-adapted for math purposes (which the poster is asking about), because that's exactly what it was designed for.

The only reason many people don't like it is because it's nearly impossible to make a decent game with it. Because that's like trying to make a graphical game with Mathematica or doing your calculus homework on a game console. That's the same reason you wouldn't make a calculation-heavy math program with Lua.

Sorry that this is off-topic, but I feel too many people just assume that certain features of the TI-Nspire are intrinsically awful without thinking about what they're meant to do.

Quote from: Dapianokid on April 03, 2013, 01:14:54 pm

I suggest using jacobly's emu for programming using your Nspire. Because Nspire basic is pretty much nonsense.

TI-Nspire BASIC is actually extremely well-adapted for math purposes (which the poster is asking about), because that's exactly what it was designed for.

The only reason many people don't like it is because it's nearly impossible to make a decent game with it. Because that's like trying to make a graphical game with Mathematica or doing your calculus homework on a game console. That's the same reason you wouldn't make a calculation-heavy math program with Lua.

Sorry that this is off-topic, but I feel too many people just assume that certain features of the TI-Nspire are intrinsically awful without thinking about what they're meant to do.

Sorry. I have looked at the language, but I don't have my Nspire juuuust yet....