calculation of a surface in graph screen

[Cryotechnic]

Given are:
x^2-6x+12 and -x^2+8x-8
Calculate the surface enclosed by the 2 equations.

I know how to calculate this on the "normal" way, without the TI-89.

I know that it's possible to calculate a surface within the "graph screen" ([F5], [7], select lower and upper limit).
In that way, it's possible to calculate the surface of each of the equations within the selected limits, compared to the x-axis. By substracting these from each other I will find the mentioned surface.
It would be much easier if it was possible to do thes all in once, is this possible?

Any idea's???
Thanks in advance

Cryotechnic

[bluesuit]

As far as I know, there is no function for calculating the area between two curves; however, you could always define a function to do that using the program editor. You could use the normal integral approach or maybe play around with using the built in area function twice and comparing the results in a function.

Best of luck
_________________
~bluesuit


"I have photographic memory, I just ran out of film"