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Appendix B: General Information 165
new battery, + side up. Replace the cover and secure it with the
screw. Use a SR44SW or 303 (or equivalent) silver oxide battery.
4. Replace the battery compartment cover. Turn the graphing handheld
on and adjust the display contrast, if necessary, by pressing y } or
†.
Important Things You Need to Know About Your
TI-84 Plus
TI-84 Plus Results
There may be a number of reasons that your TI-84 Plus is not displaying
the expected results; however, the most common solutions involve order
of operations or mode settings. Your handheld uses an Equation
Operating System (EOS) which evaluates the functions in an expression in
the following order:
1. Functions that precede the argument, such as square root, sin(, or
log(
2. Functions that are entered after the argument, such as exponents,
factorial, r, ¡, and conversions
3. Powers and roots, such as 2^5, or 5*square root(32)
4. Permutations (nPr) and combinations (nCr)
5. Multiplication, implied multiplication, and division
6. Addition and subtraction
7. Relational functions, such as > or <
8. Logic operator and
9. Logic operators or and xor
Remember that EOS evaluates from left to right and calculations within
parentheses are evaluated first. You should use parentheses where the
rules of algebra may not be clear.
If you are using trigonometric functions or performing polar and
rectangular conversions, the unexpected results may be caused by an
angle mode setting. The Radian and Degree angle mode settings control
how the TI-84 Plus interprets angle values.
To change the angle mode settings, follow these steps:
1. Press z to display the Mode settings.
2. Select
Degree or Radian.
3. Press Í to save the angle mode setting.