HP 40gs User Manual page 260

15-8
(– X) apply to it. As a result, the entered expression is
interpreted, and displayed, as (2 + X)(3 – X).
Select the entire expression
by pressing
evaluate it by pressing
. The result is:
2
–(X –X–6)
Example2
2
To enter X –3X+1, press:
2
+1
If, instead, you had to enter
2
–x –3X+1, you would need
to press:
(–)
Note that you press
applies to –X and not just to X.
Example 3
Suppose you want to enter:
Each fraction can be viewed
as a separate branch on the
equation tree. In the
Equation Writer type the first
branch:
and then select this branch by pressing
Now type + and enter the second branch:
Select the second branch by pressing
Now type + and enter the third branch:
Likewise, select the third branch by pressing
and then the fourth branch:
and
– 3
2 – 3
twice to ensure that the exponent
1 1 1 1
-- - -- - -- - -- -
+ + +
2 3 4 5
1 ÷ 2
1 ÷ 3
1 ÷ 4
1 ÷ 5
+1
.
.
, type +
Equation Writer