Hey everyone,(adsbygoogle = window.adsbygoogle || []).push({});

I've been having a little trouble with a few HW questions. If you guys could point me in the direction (ie- help me find the method to solve) I would really appreciate it. The q's are:

1. The definite integral from 3 to 8 of- x^4(ln3x)dx

For this one I am not sure wether I should make a substitution of y=3x and then do integration by parts or if there is an easier method.

2. The indefinite integral of- 27x^2(cos(3x))

Again I think that a substitution may be necessary although I can't seem to figure out what it is.

Thanks to anyone who can help me out!!!

Thanks

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# Homework Help: A couple questions on integration

**Physics Forums | Science Articles, Homework Help, Discussion**