Question about Texas Instruments TI-86 Calculator
The error 14 message is displayed when you perform calculations that involve a variable that is not defined. See the following script
2 STO-> A [ENTER] Calculator displays 2
(A+2)^2 [ENTER] Calculator displays 16
DelVar (A) [ENTER] Calculator displays Done
(A+2)^2 [ENTER] Calculator displays ERROR 14 UNDEFINED
What you may have defined then deleted, only YOU know. I suggest you reset the the calculator to defaults.
To reset calculator to defaults
It will reset the calculator to its default configuration. When you select and confirm DFLTS, the default contrast is reset.
To adjust contrast,
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Posted on Dec 02, 2009
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Posted on Jan 02, 2017
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