To enter a negative number, use the negation key. Press k and then enter the number. On the TI-84 Plus CE online calculator, negation is in the third level in the EOS™ hierarchy. Functions in the first level, such as squaring, are evaluated before negation.
Example: MX2, evaluates to a negative number (or 0). Use parentheses to square a negative number.
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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).