HP 40gs - Manual (Page 278)

16-4 Step-by-Step Examples
Press to
evaluate the selection.
It remains to transform
and combine it
with . Follow the
same procedure as
undertaken a number of
times above. You will find that is equal to
, and so the final two terms cancel each other
out.
Hence the result is
Example 3
Given the expression :
• expand and reduce D
• factor D
• solve the equation and
• evaluate D for x = 5.
Solution: First, enter D using the Equation Writer:
3 X 1
2 81
Press to select
and to
expand the expression. This
gives:
3 12
6 3 –
3 12
6 3
C 4 5 =
D 3x 1 – ( )
2
81 – =
3x 10 – ( ) 3x 8 + ( ) ⋅ 0 =
3X 1 – ( )
2
9x
2
6x – 1 81 – +
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