HOW TO FIND THE DEFINITE INTEGRAL OF A FUNCTION WITH TI89 CALCULATOR

Steps	Key Sequence	Screens
1. Input Function	Press DIAMOND key, then F1 key (for Y=)
	Type the function
Method 1: Using home screen.
2. Go to Home screen	Press 2nd, then ESC
3. Select nInt Function	Press F3
	Press ALPHA, then ( key (for nInt()
NOTE: Alternatively, you can use the integrate function, i.e., ALPHA, then 2.
4. Type in Integrand (i.e., the Function)
Note: You can either type in the function directly (e.g., 5 – 2x2 + x3) OR, if you followed step 1 above, use y1(x)
4. Type in Independent Variable	Press comma key, then x
5. Type in Lower Limit	Press comma key, then value of lower limit
6. Type in Upper Limit	Press comma key, then value of upper limit, then ) key
7. Evaluate	Press ENTER
NOTE: If you used the integrate function
Method 2: Using grapher.
Follow Step 1 above
	Type the function
2. Graph	Press DIAMOND key, then F3 key
3. Find Definite Integral	Press F5
	Press 7 (for 'integral of' f(x)dx)
	Type in lower limit
	Press ENTER
	Type in upper limit
	Press ENTER
Note: You may need to zoom out to see the entire area. If so, you will need to repeat the last step.