hp40g+.book Page 7 Friday, December 9, 2005 1:03 AM

 

• Press

again and again to progressively select

 

more of the top-most branch, and then lower

 

branches (5x, 5x + 3, and then the entire numerator

 

and finally the entire expression).

More Examples

Example1

 

 

 

If you enter:

 

 

 

 

 

 

2 + X × 3– X

 

 

and press

the

 

 

entire expression is selected.

 

 

 

 

Pressing

evaluates

 

 

 

 

what is selected (that is, the

 

entire expression) and

 

returns:

 

 

2X + 2

If you enter the same expression as earlier but press after the first X, as in:

2 + X × 3 – X

the 2 + X is selected and the next operation, multiplication, is applied to to it. The expression becomes:

(2 + X) × 3 – X

Pressing selects the entire expression, and

pressing evaluates it, resulting in:

2X + 6

Now enter the same expression, but press after the 3, as in:

2 + X × 3 – X

Note that selects the expression so far entered (2

+X) thus making the next operation apply to the entire selection, not just the last

entered term. The key

selects just the last entry (3) and makes the next operation

Equation Writer

15-7