Integrate (e^3lnx + e^3x)dx

1. Mar 18, 2007

boardinchic

1. The problem statement, all variables and given/known data
I have to integrate (e^3lnx + e^3x)dx

2. Relevant equations

3. The attempt at a solution
I have the answer and its (1/4)x^4 + (e^3x)/3 + C.
I don't know how to get to the answer without the help of my calculator.

2. Mar 18, 2007

JasonRox

I'm not surprised.

3. Mar 18, 2007

christianjb

Do you mean e^[3ln(x)]?

Try and simplify that. Remember ln(y) is the inverse operation to e^y

4. Mar 18, 2007

JasonRox

So, is this e^3*lnx or e^(3*lnx)?

First, you can separate them into two integrals of e^(3*lnx) and e^3x. I assume you can solve the second one.

So, for the integral of e^(3*lnx), I'll give you a hint.

3*lnx = ln(x^3)

5. Mar 18, 2007

boardinchic

Thank you. I got that the e^lnx = x, but didn't know what to do with the 3. I get it now.