# Math Help - Integrate

1. ## Integrate

Can someone start me out with this?

(lnx)^2 dx

I thought to make u = lnx, but then du = dx/x... I cant use it with that x, can I?

thanks!

2. Originally Posted by Morgan82
Can someone start me out with this?

(lnx)^2 dx

I thought to make u = lnx, but then du = dx/x... I cant use it with that x, can I?

thanks!
See here

3. Originally Posted by Morgan82
Can someone start me out with this?

(lnx)^2 dx

I thought to make u = lnx, but then du = dx/x... I cant use it with that x, can I?

thanks!
Remember that $\ln^2{x} = \ln{x}\cdot\ln{x}$.

So use integration by parts.

You will need to make use of the fact that $\int{\ln{x}\,dx} = x\ln{x} - x$.