If you notice there is a small k on the bottom right. The constant. Here is information about it and how to set it. I can be used for "good" not "evil" For example: If you are doing a process over and over like # X 2 + ''3. You can store the operations as k, then just put in the number and hit =. If you put in a 9 and hit =. It would show 9 X 2 +'' 3 = 21. Or maybe just X 2. Old calculators, you could hit the = to keep doing the same thing like X 2, X 2, .... This is what the k does.
=== How do I use the constant K function on the TI-30X IIS/B? ===
On the TI-30X IIS/B, pressing [2nd] [Division] turns on the constant mode and allows the user to define a constant. K appears in the top of the display when the constant mode is on. The [=] key places the contents of K at the end of the expression in the display.[br]
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***To enter a constant:***[br]
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1) Press [2nd] [Division]. If a constant is already stored, press [CLEAR] to clear it.[br]
2) Enter a constant (any set of operations, functions, and values).[br]
3) Press [=] to turn on the constant mode. K appears in the display.[br]
4) Press [CLEAR] to clear the display.[br]
5) Enter an initial value. If a value is not entered, 0 is assumed, and "Ans" will appear in the display.[br]
6) Press [=] to place the contents of K at the end of the expression and evaluate it.[br]
7) Continue pressing [=] to repeat the constant.[br]
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The result is stored in "Ans", which is displayed, and the constant is used to evaluate the new expression.
Please see the TI-30X IIS/B ++[link|https://education.ti.com/en/guidebook/details/en/706B2B75F7D3464EBE6A8F8BE9F00EAC/30xii|guidebooks|new_window=true]++for additional information.