# Changing Sing Of A Number, Variable, Or Expression; The Inverse Function; Addition, Subtraction, Multiplication, Division - HP 48gII User Manual

Graphing calculator.

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:
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:
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 `
4.2 * 2.5 `
2.3 / 4.5 `
3.7` 5.2 +
6.3` 8.5 -
4.2` 2.5 *
2.3` 4.5 /
3.7#5.2 +
6.3#8.5 -
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