# integration by parts

• Oct 24th 2009, 08:24 AM
ben.mahoney@tesco.net
integration by parts
i am having problems solving:

integral of exp(x^2)*4x with respect to x

i am using u = 4x and dv/dx = exp(x^2)

but keep going round and round without getting a decent answer.

where am i going wrong?
• Oct 24th 2009, 08:47 AM
ramiee2010
Quote:

Originally Posted by ben.mahoney@tesco.net
i am having problems solving:

integral of exp(x^2)*4x with respect to x

i am using u = 4x and dv/dx = exp(x^2)

but keep going round and round without getting a decent answer.

where am i going wrong?

use $u= x^2 \quad \Rightarrow du = 2x \cdot dx$