0 / | | 5*x | x*e dx | / 3
Integral(x*E^(5*x), (x, 3, 0))
Use integration by parts:
Let and let .
Then .
To find :
There are multiple ways to do this integral.
Let .
Then let and substitute :
The integral of a constant times a function is the constant times the integral of the function:
The integral of the exponential function is itself.
So, the result is:
Now substitute back in:
Let .
Then let and substitute :
The integral of a constant times a function is the constant times the integral of the function:
The integral of a constant is the constant times the variable of integration:
So, the result is:
Now substitute back in:
Now evaluate the sub-integral.
The integral of a constant times a function is the constant times the integral of the function:
Let .
Then let and substitute :
The integral of a constant times a function is the constant times the integral of the function:
The integral of the exponential function is itself.
So, the result is:
Now substitute back in:
So, the result is:
Now simplify:
Add the constant of integration:
The answer is:
/ | 5*x 5*x | 5*x e x*e | x*e dx = C - ---- + ------ | 25 5 /
15 1 14*e - -- - ------ 25 25
=
15 1 14*e - -- - ------ 25 25
Use the examples entering the upper and lower limits of integration.