Hp 39g Graphing Calculator Manual do Utilizador descarregar pdf (Página 25)

Quad Explorer

aplet

The Quad Explorer aplet is used to investigate the behaviour

of j = a(x + h) + V as the values of a, h and v change, both

by manipulating the equation and seeing the change in the

graph, and by manipulating the graph and seeing the change

in the equation.

HINT More detailed documentation, and an accompanying student

work sheet can be found at HP’s web site.

■BHaassraraa™

• YsK'-a

: A,

■i- t 4-

V=K'B

DISCR 0

m=o

____

__________

K2=<|

_________

When first started, the aplet is

in ia,iia,i.S3 mode, in which the

arrow keys, the [T] and

keys and the |TT| key are used

to change the shape of the

graph. This changing shape is

reflected in the equation displayed at the top right corner of

the screen, while the original graph is retained for

comparison. In this mode the graph controls the equation.

It is also possible to have the

equation control the graph.

Pressing displays a

sub-expression of your

equation (see right).

i: : : :.-a'

ill

.....

^ t 4

T=K'-a

[ilSCR (I

______________

KB=0

__________

Pressing the 0 and 0 key moves between sub

expressions, while pressing the and Q key changes

their values.

Pressing R4*1=1 allows the user to select whether all three sub

expressions will be explored at once or only one at a time.

A HSi button is provided to

evaluate the student’s

knowledge. Pressing HSl

displays a target quadratic

graph. The student must

Y=aC>l+h)2+u

Weil done !

manipulate the equation’s parameters to make the equation

match the target graph. When a student feels that they have

correctly chosen the parameters a button evaluates the

answer and provide feedback. An CliMffl button is provided

for those who give up!

Getting started

1-13

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