# Solve function with Y functions?

• Mar 27th 2007, 10:54 AM
Zets
Solve function with Y functions?
Hello, I am having a problem using the Solve() function with equations with the Y function in them. I have a TI-89 Titanium.

Here are my Y functions:
Y2: B+2*C+3*D+F-G+K
Y3: K*(C-A+2*D+F-G)+K*L-O
Y4: K*L*(D-2*A-B+F-G)+K*L*M-K*O
Y5: K*L*M*(F-G-3*A-2*B-C)-K*L*O
Y6: -K*L*M*O

My Solve function is:

Solve(X^5+Y2()*X^4+Y3()*X^3+Y4()*X^2+Y5()*X+Y6()=0 ,X)
I am getting the "Too few arguments" error.

I have also made a program for storing in the values of A,B,C,D,F,G,K,L,M, and O

A = .056
B = 0
C = 0
D = 0
F = 0
G = 0
K = .00066
L = 0
M = 0
O = 10^-14

After storing these values, I proceed to use the solve function but I am unable to do so.
Edit: I plugged in the Y equations and it worked, but I still would like to know if it's possible to keep the Y(n) in the original equation.
• Mar 28th 2007, 04:31 AM
earboth
Quote:

Originally Posted by Zets
Hello, I am having a problem using the Solve() function with equations with the Y function in them. I have a TI-89 Titanium.

Here are my Y functions:
Y2: B+2*C+3*D+F-G+K
Y3: K*(C-A+2*D+F-G)+K*L-O
Y4: K*L*(D-2*A-B+F-G)+K*L*M-K*O
Y5: K*L*M*(F-G-3*A-2*B-C)-K*L*O
Y6: -K*L*M*O

Hello,

when you store the term of a function with the Y=-editor you have to use an independent variable (mostly x). Otherwise your functions are constants. Have a look at the entry row of the y=-editor: It starts with y1(x)=

Quote:

My Solve function is:

Solve(X^5+Y2()*X^4+Y3()*X^3+Y4()*X^2+Y5()*X+Y6()=0 ,X)
I am getting the "Too few arguments" error....
This error occurs because you used an empty bracket with the name of the function. If the name of the independent variable is x then you have to use yn(x)

EB