HP 10413 Datasheet download pdf (Page 65)

Signed area…

Another very useful tool provided in the menu is the Signed Area…

tool. Before we begin to use it, make sure that is switched on, and

that the cursor is on F1(X) - the quadratic. The Signed Area… tool is similar

to the Box Zoom in that it requires you to indicate the start and end points of

the area to be calculated.

Definite integrals

Suppose we want to find the definite integral:

xdx

−

−−

∫

Choose and then Signed Area… You

will see the message shown right, asking you

to choose a starting point.

Press the key, enter the value -2 and press or ENTER. The

starting value will then be -2 so press again (or ENTER) to accept it.

Another menu will appear, asking you to

indicate what area you wish to calculate. In

this case there are only two choices - between

F1(X) and the X axis, or between F1(X) and

F2(X).

If we had defined more functions in the SYMB view then this menu would be

longer. In this case we want the area between F1(X) and the x axis, so

position the highlight as shown and press ENTER.

The graphs will then reappear, with a message

requesting that you choose an end point. In the

screenshot shown right I have pressed

and entered the value 3 to move to that point

directly.

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HP 10413 Datasheet Page 65