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 2^{nd}, 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 – 2x^{2} + x^{3}) 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. 