HP 50g Graphing Calculator - Manual (Page 134)

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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 /
Using parentheses
Parentheses can be used to group operations, as well as to enclose arguments
of functions. The parentheses are available through the keystroke combination
„Ü
. Parentheses are always entered in pairs. For example, to calculate
(5+3.2)/(7-2.2):
In ALG mode:
„Ь5+3.2™/„Ь7-2.2`
In RPN mode, you do not need the parenthesis, calculation is done directly on
the stack:
5`3.2+7`2.2-/
In RPN mode, typing the expression between quotes will allow you to enter the
expression like in algebraic mode:
³„Ь5+3.2™/
„Ь7-2.2`μ
For both, ALG and RPN modes, using the Equation Writer:
‚O5+3.2™/7-2.2
The expression can be evaluated within the Equation writer, by using:
————
@EVAL@ or, ‚—@EVAL@
Absolute value function
The absolute value function, ABS, is available through the keystroke
combination: „Ê. When calculating in the stack in ALG mode, enter the
function before the argument, e.g., „Ê \2.32`
In RPN mode, enter the number first, then the function, e.g.,
2.32\„К