Texas Instruments TI-84 - Manual (Page 645)

Appendix B: Reference Information 642
Important Things You Need to Know About Your Important Things You Need to Know About Your Important Things You Need to Know About Your Important Things You Need to Know About Your
TI-84 Plus TI-84 Plus TI-84 Plus TI-84 Plus
TI-84 Plus Results TI-84 Plus Results TI-84 Plus Results 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 calculator 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.