HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 128

Changing sign of a number, variable, or expression Use the \ key. In ALG mode, you can press \ before entering the number, e.g., \2.5`. Result = -2.5. In RPN mode, you need to enter at least part of the number first, and then use the \ key, e.g., 2.5\. Result = -2.5. If you use the \ function while there is no command line, the calculator will apply the NEG function (inverse of sign) to the object on the first level of the stack. The inverse function Use the Ykey. In ALG mode, press Y first, followed by a number or algebraic expression, e.g., Y2. Result = ½ or 0.5. In RPN mode, enter the number first, then use the key, e.g., 4`Y. Result = ¼ or 0.25. Addition, subtraction, multiplication, division Use the proper operation key, namely, + - * /. In ALG mode, press an operand, then an operator, then an operand, followed by an ` to obtain a result. Examples: 3.7 + 5.2 ` 6.3 - 8.5 ` 4.2 * 2.5 ` 2.3 / 4.5 ` The first three operations above are shown in the following screen shot: In RPN mode, enter the operands one after the other, separated by an `, then press the operator key. Examples: 3.7` 5.2 + 6.3` 8.5 4.2` 2.5 * 2.3` 4.5 / Alternatively, in RPN mode, you can separate the operands with a space (#) before pressing the operator key. Examples: 3.7#5.2 + 6.3#8.5 - Page 3-3