1. ## integration by subsitution.

Hey,

use the subsitution u=3x-1 to express the following as an integral in terms of u. Hence, find the following, giving your answer in terms of x.

thank you!

2. Okay, what have you done and where are you having problems?

3. well...
so the new form is

do we continue by integration by parts?

4. Originally Posted by Oasis1993
well...
so the new form is

do we continue by integration by parts?

You should convert everything in the integral to an expression in terms of u according to your substitution.

5. If u= 3x-1, then x= ?