# How to integrate a function (Definite Integral)

## How to integrate a function (Definite Integral)

Tricks applicable for Calc Model: CASIO fx-570MS, CASIO fx-991MS, and other similar operation model.

### What is Integration?

-Integration is the act of bringing together smaller components into a single system that functions as single unit.
-Integration can be used to find Areas, Volumes, etc.

#### What is definite integral?

-A definite integral has start and end values (ie Limit), in other word there is an interval (a to b).
-Integration in this case takes place in a limit of the interval.

Calculator can easily perform definite integration (ie integration with limit).
Mainly three inputs are required for the operation. They are a function with variable x, lower limit, and upper limit.

We can understand the trick easily with following example, so let start…
Example: What is the value of
25(x3-5x-3)dx is?
a) 129/12
b) 363/4
c) 65/7
d) 1/2

#### Solution:

STEPS:

∫dx >> ALPHA >> ) >> SHIFT >> x2 >> - >> 5 >> ALPHA >> ) >> - >>3 >> , >> 2(lower limit first) >> , >> 5(upper limit second) >> ) >> =(90.75)