Complex Numbers - HP 40G User Manual

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Converting a
number to a
fraction

Complex numbers

Complex results
To enter complex
numbers
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When converting a number to a fraction, keep the following
points in mind:
• When converting a recurring decimal to a fraction, set the
fraction precision to about 6, and ensure that you include
more than six decimal places in the recurring decimal
that you enter.
In this example, the
fraction precision is set
to 6. The top calculation
returns the correct result.
The bottom one does not.
• To convert an exact decimal to a fraction, set the fraction
precision to at least two more than the number of decimal
places in the decimal.
In this example, the
fraction precision is set
to 6.
The HP 39G/40G can return a complex number as a result for
some math functions. A complex number appears as an
ordered pair (x, y), where x is the real part and y is the
imaginary part. For example, entering
Enter the number in either of these forms, where x is the real
part, y is the imaginary part, and i is the imaginary constant,
1 – :
• (x, y) or
• x + iy.
To enter i:
• press I
or
• press , or keys to select Constant,
to move to the right column of the menu,
and .
PF—
1 – returns (0,1).
to select i,
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