Example 3 – HP 40gs User 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
–
+
hp40g+.book Page 4 Friday, December 9, 2005 1:03 AM
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