HP Prime Graphing NW280AAABA manual More Tangent

Add a tangent 8. We will now add a tangent to the curve, making point B the point of tangency:

> More > Tangent

9.Tap on point B, press Eand then press J.

A tangent is drawn through point B. (Depending on where you placed point B, your illustration might be different from the one at the right.)

We’ll now make the

tangent stand out by giving it a bright color.

10.If the curve is selected, tap a blank area of the screen to deselect, and then tap on the tangent to select it.

11.Press Zand select Change Color.

12.Pick a color from the color-picker, press Eand then tap on a blank area of the screen. Your tangent should now be colored.

13.Press Eto select point B.

If there is only one point on the screen, pressing E automatically selects it. If there is more than one point, a menu will appear asking you to choose a point.

14.With point B selected, use the cursor keys to move it about.

Note that whatever you do, point B remains constrained to the curve. Moreover, as you move point B, the tangent moves as well. (If it moves off the screen, you can always bring it back by dragging your finger across the screen in the appropriate direction.)

15.Press Eto deselect point B.

Note that there are two ways to move a point after it is selected: (a) using the cursor keys, as described above, and

(b)using your finger. If you use the cursor keys, pressing J will cancel the move and put the point back where it was, while pressing Ewill accept the move and deselect the point. If you use your finger to move the point, lifting your

Geometry 137