30 Evaluating Expressions
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.
Entering an Expression
To create an expression, you enter numbers, variables, and functions using the
keyboard and menus. An expression is evaluated when you press Í,
regardless of the cursor location. The entire expression is evaluated according
to EOS™ rules, and the answer is displayed according to the mode setting for
Answer.
Note: Most TI-84PlusCE functions and operations are symbols comprising
several characters. You must enter the symbol from the keyboard or a menu;
do not spell it out. For example, to calculate the log of 45, you must press «
45. Do not enter the letters L, O, and G. If you enter LOG, the TI-84PlusCE
interprets the entry as implied multiplication of the variables L, O, and G.
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