# [SOLVED] TI-89 Titanium: SOLVE AN EQUATION

• Aug 26th 2008, 12:28 PM
tupac
[SOLVED] TI-89 Titanium: SOLVE AN EQUATION
Ok so the equation is this: 3x^4-4x^3+8=0

When i solve for it, the calculator says this: False

Am i doing something wrong?

Can you tell me what i could do to get a number answer?(what should i press)
• Aug 26th 2008, 12:35 PM
Moo
Quote:

Originally Posted by tupac
Ok so the equation is this: 3x^4-4x^3+8=0

When i solve for it, the calculator says this: False

Am i doing something wrong?

Can you tell me what i could do to get a number answer?(what should i press)

cZeros(3x^4-4x^3+8,x) (complex solutions because there is no real solution) instead of Zeros(3x^4-4x^3+8,x) (menu F2)

Also, my TI89 just gives {} when I press Zeros. If it yields false, check that you have no stored variable named x, or maybe because I have a titanium and I don't.
• Aug 26th 2008, 12:42 PM
tupac
Thanks
• Aug 26th 2008, 12:43 PM
Chris L T521
Quote:

Originally Posted by tupac
Ok so the equation is this: 3x^4-4x^3+8=0

When i solve for it, the calculator says this: False

Am i doing something wrong?

Can you tell me what i could do to get a number answer?(what should i press)

You're not doing anything wrong. Just do what Moo suggested.

Use:

Code:

`csolve(3x^4-4x^3+8=0,x)`
You will get ugly complex numbers....

Also, when you say "number answer", do you mean exact number, or approximate number?

--Chris
• Oct 14th 2008, 05:54 AM
shailen.sobhee
Enable Pretty Print (on TI89 Titanium) to make the ugly complex numbers more readable.