Texas Instruments TI-84 PLUS SILV Guidebook - Page 398

where: M1 DT1 Y1 M2 DT2 Y2 MB DB YB = month of first date = day of first date = year of first date = month of second date = day of second date = year of second date = base month (January) = base day (1) = base year (first year after leap year) 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 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. In OS 2.53 MP, parentheses may be pasted in an expression to indicate how the input is interpreted. 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. Appendix B: Reference Information 391