Operation Manual

Chapter 1: Getting Started with the TI-84 Plus C Silver Edition 17

EOS™ evaluates the functions in an expression in this order.

Note: Within a priority level, EOS™ evaluates functions from left to right. Calculations within

parentheses are evaluated first.

Implied Multiplication

The TI-84 Plus C recognizes implied multiplication, so you need not press ¯ to express multiplication in

all cases. For example, the TI-84 Plus C interprets

2p, 4sin(46), 5(1+2), and (2…5)7 as implied

multiplication.

Note: TI-84 Plus C implied multiplication rules differ from those of some other graphing calculators. For

example, the TI-84 Plus C evaluates

1à2X as (1à2)…X, while some graphing calculators may evaluate

1à2X as 1à(2…X) (Chapter 2 in the guidebook).

Parentheses

All calculations inside a pair of parentheses are completed first. For example, in the expression 4(1+2),

EOS™ first evaluates the portion inside the parentheses, 1+2, and then multiplies the answer, 3, by 4.

Negation

To enter a negative number, use the negation key. Press Ì and then enter the number. On the

TI-84 Plus C, negation is in the third level in the EOS™ hierarchy. Functions in the first level, such as

squaring, are evaluated before negation.

Order

Number

Function

1 Functions that precede the argument, such as ‡,

sin(, or log(

2 Functions that are entered after the argument,

such as

, !, ¡,

, and conversions

Powers and roots, such as 2

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