[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)

Quote:

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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)

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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.

Thanks

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)

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

Use:

Code:

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csolve(3x^4-4x^3+8=0,x)

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You will get ugly complex numbers....

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

--Chris

Enable Pretty Print (on TI89 Titanium) to make the ugly complex numbers more readable.