HP Prime Graphing NW280AAABA manual Analyzing functions, Display the Plot view menu, =or

Analyzing functions

Display the Plot view menu

To find a root of the quadratic function

The Function menu ( ) in Plot view enables you to find roots, intersections, slopes, signed areas, and extrema for any function defined in the Function app. If you have more than one function plotted, you may need to choose the function of interest beforehand.

The Function menu is a sub-menu of the Plot view menu. First, display the Plot view menu:

P

Suppose you want to find the root of the quadratic equation defined earlier. Since a quadratic equation can have more than one root, you will need to move the cursor closer to the root you are interested in than to any other root. In this example, you will find the root of the quadratic close to where x = 3.

1.If it is not already selected, select the quadratic equation:

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2.Press >or<to move the cursor near to where x = 3.

3.Tap and select Root

The root is displayed at the bottom of the screen.

If you now move the trace cursor close to x = –1 (the other place where the

quadratic crosses the x-axis) and select Root again, the other root is displayed.

118 Function app