HP 40gs User Manual page 278

hp40g+.book Page 4 Friday, December 9, 2005 1:03 AM
Example 3
16-4
Press to
evaluate the selection.
It remains to transform
3 12
and combine it
– 6 3
with . Follow the
same procedure as
undertaken a number of
times above. You will find that
6 3
, and so the final two terms cancel each other
out.
Hence the result is
C = 4 5
D
Given the expression
•
expand and reduce D
•
factor D
(
•
solve the equation
•
evaluate D for x = 5.
Solution: First, enter D using the Equation Writer:
3 X 1
2 81
Press to select
2
( )
3X 1 –
and to
expand the expression. This
2
9x – 6x + 1 81 –
gives:
3 12
is equal to
2
( )
= 3x 1 – – 81
:
) ⋅ ( )
3x 10 – 3x + 8 = 0
and
Step-by-Step Examples