Question

how to find definite integral​

Answer 1

Answer:

and then finish with dx to mean the slices go in the x direction (and approach zero in width).

A Definite Integral has start and end values: in other words there is an interval [a, b].

We find the Definite Integral by calculating the Indefinite Integral at a, and at b, then subtracting:

Answer 2

to find definite integral refer the below example:

Example: What is

2

∫

1

2x dx

We are being asked for the Definite Integral, from 1 to 2, of 2x dx

First we need to find the Indefinite Integral.

Using the Rules of Integration we find that ∫2x dx = x2 + C

Now calculate that at 1, and 2:

At x=1: ∫2x dx = 12 + C

At x=2: ∫2x dx = 22 + C

Subtract:

(22 + C) − (12 + C)

22 + C − 12 − C

4 − 1 + C − C = 3

And "C" gets cancelled out ... so with Definite Integrals we can ignore C.

Result:

2

∫

1

2x dx = 3

i hope this helps you...

plz mark it as brainliest..