Function Integration
Suppose we want to use the calculator to compute the intergral
Press and enter the function into Y1.
Make sure the function is turned on.
Method 1: Using the command fnInt
The syntax for this command is: fnInt(function,X,a,b)
where a is the starting value and b is the ending value of the integral.
From the home screen do the following.
- Press
- Choose 9:fnInt.
- Now enter the variable name that corresponds to where the formula was entered, for example Y1
- Note: You may choose to just type the function at this point.
- Press
- Type the starting value. For this example press
- Press
- Type the ending value. For this example press
- Press
- Press
Using the example from above should now display the following.
If needed you can convert the answer to a fraction.
Method 2: Using a Graphing Screen
- Press and enter the function into Y1.
- Set thewindow. Be sure that the starting and ending value for the integral is between the X-min and X-max values. For this problem I used
X-min = -10, X-max = 10, Y-min = -10, and Y-Max = 100
- Note: The y-scale is not important. The Zoom Fit option may be used for these values.
- Press
- Press
- Choose 7:f(x)dx.
- You will now see the words LowerLimit?. Enter the starting value for the integral. For the above example this is 1. The calculator should now display the following.
- Press
- You will now see the words UpperLimit?. Enter the ending value for the integral. For the above example this is 5. The calculator should now display the following.
- Press
The calculator should now display the following.
It is not possible to convert the answer from this method to a fraction.