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Note: Within a priority level, EOS™ evaluates functions from left to right. Calculations
within parentheses are evaluated first. A number in scientific or engineering notation,
2.34â6, is interpreted as (2.3x10
6
) with parentheses so the number remains the correct
value during the EOS™ calculation.
Implied Multiplication
The TI-84PlusCE recognizes implied multiplication, so you do not need to press ¯ to
express multiplication in all cases. For example, the TI-84PlusCE interprets 2p, 4sin
(46), 5(1+2), and (2 ä 5)7 as implied multiplication.
Note: TI-84PlusCE implied multiplication rules differ from those of some other
graphing calculators. For example, the TI-84PlusCE evaluates 1à2X as (1à2) X, while
some graphing calculators may evaluate 1à2X as 1à(2 X).
Parentheses
The TI-84 Plus CE completes all calculations inside a pair of parentheses 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 k and then enter the
number. On the TI-84PlusCE, negation is in the third level in the EOS™ hierarchy.
Functions in the first level, such as squaring, are evaluated before negation.
Example: MX
2
, evaluates to a negative number (or 0). Use parentheses to square a
negative number.
Note: Use the j key for subtraction and the k key for negation. If you press j to
enter a negative number, as in 9 ¯ ¹ 7, or if you press k to indicate subtraction, as
in 9 k 7, an error occurs. If you press ƒ A k ƒ B, it is interpreted as implied
multiplication (A)(MB).
Entering Expressions and Instructions
You can use an expression on the home screen to calculate an answer. In most places
where a value is required, you can use an expression to enter a value.
Evaluating Expressions 25
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