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Chapter 4: Conics Application
115
4-1
Inputting an Equation
You can select one of the preset Conics Forms or input a conics equation manually. You can also transform a
manually input equation to a Conics Form.
u
To input an equation using a Conics Form
1. On the Conics Editor window, tap
q
to displays the
Select Conics Form dialog box.
2. Select the Conics Form of the type of equation you
want to graph, and then tap [OK].
• This displays the Conics Editor window, which will
contain the selected Conics Form.
3. Change the coefficients of the equation as required.
Horizontal Parabola 1
Horizontal Parabola 2
Vertical Parabola 1
Vertical Parabola 2
Circle 1
Circle 2
Ellipse
Horizontal Hyperbola
Vertical Hyperbola
General Form
0401
To use a Conics Form to input the equation for a parabola with a horizontal axis (principal axis parallel
with
x
-axis)
u
To input an equation manually
Make the Conics Editor window active, and then use the soft keyboard for input.
u
To transform a manually input equation to a Conics Form
0402
To transform the equation
(
− 1)
2
2
2
2
4
+ (
− 2)
2
=
to the standard Conics Form
x
= A
y
2
+ B
y
+ C
Tip
• If the equation you input cannot be transformed into the standard Conics Form you selected, the message “Can’t
Transform into This Type” appears.
• An input equation may not transform correctly if it includes a square root calculation or some other function.
4-2
Drawing a Conics Graph
Tip:
You can drag the Conics Graph window screen to scroll (pan) its contents (except for Trace, Sketch, G-Solve, box
zoom, and certain other functions).
Drawing a Parabola
A parabola can be drawn with either a horizontal or vertical orientation. The parabola type is determined by the
direction of its principal axis.
• A parabola with a horizontal axis is one whose principal axis is parallel to the
x
-axis. There are two possible
equations for a parabola with a horizontal axis:
x
= A(
y
– K)
2
+ H and
x
= A
y
2
+ B
y
+ C.
0401
To draw the parabola
x
= 2(
y
– 1)
2
– 2
• A parabola with a vertical axis is one whose principal axis is parallel to the
y
-axis. There are two possible
equations for a parabola with a vertical axis:
y
= A(
x
– H)
2
+ K and
y
= A
x
2
+ B
x
+ C.