Solution 26450: Changing the +/- sign of an answer on the TI-30X IIS and TI-30X IIB.
How do I change the +/- sign of an answer on the TI-30X IIS/B?
The [+/-] key was used on the TI-30Xa calculator to change an answer from a positive number to a negative number. This key is not present on the TI-30X IIS or the TI-30X IIB units. So to perform this function on the TI-30X IIS or TI-30X IIB:
• Enter your problem. ex. 88+44 and press [ENTER] You will get 132.
• Now press the negate key [(-)]. The screen will show " - "
• Then press the [2nd] key and the [(-)] key again. The screen will show " - Ans "
• Now press [ENTER] and the sign of your answer should now be changed.
Please see the TI-30X IIS or the TI-30X IIB guidebook for more information.