HP 48gx User Manual

Lesson 27: Finding Slope, Tangents, and
Critical Points
The following examples show you other kinds of analysis you can
perform on the currently plotted function.
Example: Using the same polynomial you just plotted in the
previous lesson (X° + X* — 5X3 — 2X? + X — 4), find the
slope at # = —0.4 and draw a tangent line to the function
at x = 0.3.
Step 1: Turn on TRACE mode and move the cursor using the («)
and (») keys.
(to redisplay the menu)
PICT TRADE
(«€) and (») as needed
L. §
ETRE Er IEE FETE ETT
Step 2: Display the cursor coordinates and move the cursor over
until the z-coordinate equals -0.4.
nr
<
as
needed
|
|
|
oo
1
™
n= ¥: -Y4.38464
Step 3: Find the slope.
(to redisplay the menu)
:
SLOPE: 07d
tting Equations and Analyzing Graphs 6-15

HP 48gx Specifications

General

Model	HP 48gx
Type	Graphing Calculator
Display Type	LCD
Display Size	131x64 pixels
Memory	128 KB RAM
Expandable Memory	Yes, via expansion cards
Release Year	1993
Processor	Saturn
Programming Language	RPL
Power Supply	3x AAA batteries
Weight	255 g (9 ounces)