Ti-89 Titanium Why do i keep getting "error: argument error"?

Question

I've been trying to differentiate with my TI-89 but everytime i put something in it says "error: argument error". I borrowed my friend's Ti-89 and put in the exact same thing, the calculator gave me a derivative.
So i tested it again. I told it to "factor(x^2-9)" and it gave me the same thing "error: argument error"

What can i do to make it go back to giving me answers?!

Answer 1

Did you instal anything on it?

Try executing the "Clear A-Z" command under the "Clean Up" menu (F6).

You can find special characters like "?" under the "CHAR" menu, which is [2nd]+[PLUS] on the TI-89T. The third submenu, "Punctuation", has a question mark as the 8th entry.

Hope this helps.

Steve
http://411newyork.org/forum/index.php?showforum=33

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Answer 3

you might have a number saved as a letter.

clear a-z

i think it is in F6