HP HP-28S - Page 102

Look at the graph you made in the last chapter, on page 96. It shows
that the expression has a positive local minimum and a positive local
maximum. The Solver can find the minimum, because locally it's the
point closest to the x-axis; but the Solver can't find the maximum,
because locally it's the point farthest from the x-axis.
In this section you'll plot the expression, using the plotting parameters
stored in the variable PPARl, then digitize three points to estimate
the minimum, and then use the Solver to find a more accurate
minimum.
Return the list stored in PPARI to the stack.
1 USER I PPAR 1
1: { (-1.50~1.20)
(2.10,3.b0) X 1.00
(0.00,0.00) }
.. 1DiW1DlIIJ_lli!lDmJI
Restore the variable PPAR to the values stored in PPARl.
~ PPAR 1 STO I
Plot the expression.
.1 PLOT I DRAW
3:
2:
1: -1. 36
.. 1DiW1DlIIJ_lli!lDmJI
I/~'I
Move the cross hairs to the approximate minimum.
Digitize the point.
IT@]
8: The Solver 101