HP 40gs User Manual
Page 260
15-8
Equation Writer
(– 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
and
evaluate it by pressing
. The result is:
–(X
2
–X–6)
Example2
To enter X
2
–3X+1, press:
2
– 3
+1
If, instead, you had to enter
–x
2
–3X+1, you would need
to press:
(–)
2
– 3
+1
Note that you press
twice to ensure that the exponent
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:
1 ÷ 2
and then select this branch by pressing
.
Now type + and enter the second branch:
1 ÷ 3
Select the second branch by pressing
.
Now type + and enter the third branch:
1 ÷ 4
Likewise, select the third branch by pressing
, type +
and then the fourth branch:
1 ÷ 5
1
2
---
1
3
--- 1
4
--- 1
5
---
+ + +
hp40g+.book Page 8 Friday, December 9, 2005 1:03 AM