Mathematical Calculations - HP 39G User Manual

Mathematical calculations

Where to start
Entering
expressions
Example
Long results
Negative
numbers
1-18
The most commonly used math operations are available from
the keyboard. Access to the rest of the math functions is via
the MATH menu ( ).
To access programming commands, press
"Programming commands" on page 15-14 for further
information.
The home base for the calculator is the HOME view
( ). You can do all calculations here, and you can
access all operations.
• Enter an expression into the HP 39G/40G in the same
left-to-right order that you would write the expression.
This is called algebraic entry.
• To enter functions, select the key or MATH menu item
for that function. You can also enter a function by using
the Alpha keys to spell out its name.
• Press to evaluate the expression you have in the
edit line (where the blinking cursor is). An expression
can contain numbers, functions, and variables.
2
23 – 14 8
--------------------------- -
Calculate ln 45
3 –
23
14
8
3
45
If the result is too long to fit on the display line, or if you want
to see an expression in textbook format, press
it and then press .
Type to start a negative number or to insert a negative
sign.
To raise a negative number to a power, enclose it in
parentheses. For example, (–5)
. See
CMDS
:
to highlight
2 2
= 25, whereas –5 = –25.
Getting started