HP 40G Mathematical calculations, Entering expressions, Long results Negative numbers, Example

Mathematical calculations

The most commonly used math operations are available from the keyboard. Access to the rest of the math functions is via the MATH menu (>0$7+@).

To access programming commands, press >6+,)7@ CMDS. See “Programming commands” on page 15-14 for further information.

Where to start The home base for the calculator is the HOME view (>+20(@). You can do all calculations here, and you can access all >0$7+@ operations.

Entering expressions

Example

Long results

Negative numbers

•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 >(17(5@ to evaluate the expression you have in the edit line (where the blinking cursor is). An expression can contain numbers, functions, and variables.

Calculate	232	– 14	8	ln (45) :
	---------------------------	– 3

>￿@23>[￿, >￿@14 >;@>6+,)7@√ 8>￿@ >j@>￿￿￿@3 >OQ@45 >￿@ >(17(5@

If the result is too long to fit on the display line, or if you want to see an expression in textbook format, press *k, to highlight it and then press 6+2:a.

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) 2 = 25, whereas –5 2 = –25.

1-18 Getting started