Casio fx-9860GII - 2.3 Finding maximum and minimum points

Using a graphic display calculator
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Casio fx-9860GII
Press
F4
Sketch.
Press
F2
Tang.
The calculator displays the trace screen.
Press
(–)
0
.
5
EXE
.
Press
EXE
.
The equation of the tangent is y = −3.25x + 5.75.
2.3 Finding maximum and minimum points
Example 31
Find the local maximum and local minimum points on the cubic curve.
First draw the graph of y = x
3
− 2x
2
− 6x + 5 (see Example 29).
Press
SHIF T
F5
G-Solv.
Press
F2
MAX to fi nd the maximum point.
The calculator displays the local maximum at the point (−0.897, 8.05).
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