How to draw the extreme value of the function image of the guide function by the geometrical sketchpad

the specific steps are as follows:

1. Open the geometry artboard software, "drawing"-"draw a new function", in the function editor, enter the function of the following diagram, click "OK".

In function Editor input function parse

2. Right-key function analytic type, choose "Define Guide Function", appear guide function analytic formula. Right-key function, select "Draw function", in the drawing area will appear the original function of the Guide function (blue).

The right key function defines the Guide function and draws the guidance function image

3. Select the drawn Guide function image and X axis, "construct"-"intersection", get point A. Because the original function is not available at point B, drawing--draw point, Draw point B ( -4,0).

To construct a guide function that intersects the x-axis and draws point B

4. Select point B and Point A, "metric"-"horizontal axis", the horizontal axis value is the original function monotone interval of turning point.

Select point B and point A to perform "metric"--"horizontal axis"

Note: At draw point B, the derivative does not exist, so the original function at point B has a maximum value of 0, at point A has a minimum value.