4-3-1

Drawing a Conics Graph

4-3 Drawing a Conics Graph

This section provides examples that show how to draw various types of conics graphs.

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.

kDrawing a Parabola that Opens Horizontally

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 = Ay2 + By + C.

Example 1: To draw the parabola x = 2(y – 1)2 – 2

u ClassPad Operation

(1)On the Conics Editor window, tap q, or tap [Form] and then [Insert Conics Form].

•This displays the Select Conics Form dialog box.

(2)Select “X = A(Y – K)2 + H” and then tap [OK].

•This closes the Select Conics Form dialog box, and displays the selected equation in the Conics Editor window.

(3)Change the coefficients of the equation as follows: A = 2, K = 1, H = –2.

(4)Tap ^ to graph the equation.

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