HP 10413 Datasheet download pdf (Page 66)

100

101

If you now press ENTER again to accept the

end point, the hp 39g+ will calculate the signed

area and display the result at the bottom of the

screen.

Calculator Tip

It should be clearly understand that although the

label at the bottom of the screen is Area it is a

little misleading.

What has actually been calculated is the definite

integral (right), with ‘areas’ below the x axis

included as negatives. This is why the label on

the original menu reads “Signed area” instead of

just “Area”.

2ndpoint

1stpoint

1( )

Xdx

∫

Tracing the integral in

PLOT

Rather than using the key, an alternative

method is to use the tracing facility. The

advantage of this is that the ‘area’ is shown

visually as you go by shading, as can be seen

right.

The disadvantage of this is that you can only trace to values which are

permitted in the scale you are using. As soon as you use the shading

stops. In this case, due to the scale we chose, if you try to trace to the values

x = -3 or x = 2 you will find that they are not accessible so we will need to

change scale.

Change to the PLOT SETUP view and change

the x axis (only) back to -6.5 to 6.5, then

PLOT again.

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HP 10413 Datasheet Page 66

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