Calculators TI-89 Titanium Help: Decimal Conversion & Tutorials

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    Ti-89 Titanium
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The TI-89 calculator can be configured to display results in decimal or fraction form by adjusting the "Exact/Approx" mode. To obtain decimal results, users can press the diamond key followed by enter or change the mode to "Approx." In "Auto" mode, adding a decimal point to a number will yield a decimal result, while entering a whole number will provide a reduced fraction. For polynomial division, users can assign polynomials to variables and use the propFrac function. To convert decimals to fractions, the exact() function can be used or the decimal can be divided by a power of ten based on significant figures. Users seeking additional resources can find user-made programs on websites like ticalc.org. For troubleshooting, ensuring variables are cleared and using the correct syntax is essential, especially when factoring or graphing functions. The calculator can also be reset to resolve persistent issues.
  • #31
Mark44 said:
My guess is that the calculator doesn't like 8x, and that the expression on the right should be 8*x*cos(x).

8x*cos(x) graphs fine for me on my 89.
 
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  • #32
i am having trouble factoring :(
when i try to factor 4x^3+12x^2-8x i end up getting 4x(x-.561..)(x+3.561..)
i don't know if i have the settings wrong or something
PLEASE HELP
 
  • #33
awesome123333 said:
i am having trouble factoring :(
when i try to factor 4x^3+12x^2-8x i end up getting 4x(x-.561..)(x+3.561..)
i don't know if i have the settings wrong or something
PLEASE HELP

get it off decimal mode. I don't have one, so I don't know exactly how, but that is what you need to do. My calculator (a casio classpad) refers to non-decimal mode as "standard" mode.
 
  • #34
I need help with my Ti 89. When I factor or solve from the F1 algebra menu it gives me answers in matrix format. I have tried clearing memory and reformatting... Please help!
 
  • #35
swimgirl said:
I need help with my Ti 89. When I factor or solve from the F1 algebra menu it gives me answers in matrix format. I have tried clearing memory and reformatting... Please help!
What you need to do, is push the mode button, press f2 to go to the second page, scroll down to "Exact/Approx". You need to change this to Exact, or Auto. This should solve your problem.
 

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