HP 35s User Manual page 132

Example: Using Guesses to Find a Root.
Using a rectangular piece of sheet metal 40 cm by 80 cm, form an open–top box
having a volume of 7500 cm
amount to be folded up along each of the four sides) that gives the specified
volume. A taller box is preferred to a shorter one.
H
40 _ 2 H
40
H
If H is the height, then the length of the box is (80 – 2H) and the width is (40 – 2H).
The volume V is:
which you can simplify and enter as
Type in the equation:
Keys:


4
HÕ
7-10
Solving Equations
3
. You need to find the height of the box (that is, the
H
V = ( 80 – 2H )
V= ( 40 – H )
Display:
_
_
80 _ 2 H
80
(40 – 2H ) H
( 20 – H ) 4 H
Selects Equation mode and starts
the equation
H
Description: