Casio CFX-9850G PLUS, User'S Manual & Technical Reference

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14-3 Conic Section Graph Analysis
You can determine approximations of the following analytical results using conic
section graphs.
• Focus/vertex calculation
• Latus rectum calculation
• Center/radius calculation
•
x
-/
y
-intercept calculation
• Directrix/axis of symmetry drawing and analysis
• Asymptote drawing and analysis
After graphing a conic section, press
5
(G-Solv) to display the Graph Analysis
Menu.
Parabolic Graph Analysis
•
{ FOCS } ... {determines the focus}
•
{
SYM
}
/
{
DIR
} ... draws the {axis of symmetry}/{directrix}
• { VTX } / { LEN } ... determines the {vertex}/{latus rectum}
Circle Graph Analysis
•
{
CNTR
}
/
{
RADS
} ... determines the {center}/{radius}
Ellipse Graph Analysis
•
{ FOCS } / { X-IN } / { Y-IN } ... determines the {focus}/{
x
-intercept}/{
y
-intercept}
Hyperbolic Graph Analysis
•
{
FOCS
}
/
{
X-IN
}
/
{
Y-IN
}
/
{
VTX
} ... determines the {focus}/{
x
-intercept}/{
y
-intercept}/
{vertex}
• { ASYM } ... {draws the asymptote}
The following examples show how to use the above menus with various types of
conic section graphs.
u u
u u u
To calculate the focus and vertex
[G-Solv]
-
[FOCS]
/
[VTX]
Example To determine the focus and vertex for the parabola
X = (Y – 2)
2
+ 3
Use the following View Window parameters.
Xmin = –1 Ymin = –5
Xmax = 10 Ymax = 5
Xscale = 1 Yscale = 1