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    Hi,
    Just checking that the internal x^5rt(x^3+1)
    can be done by either substitution or by parts. Can someone please confirm that the answer by substitution (i used x^3 +1) is 2/15(x^3+1)^5/2 - 2/9(x^3+1)^3/2 )
    I am checking this because the integration by parts method gives a different format.

    Thank you for you help
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    Yes, your result is correct (assuming lots of things about your ambiguous bracketing or lack thereof).

    It's fairly easy to check answers using Wolfram Alpha - here's how I checked your integral without actually bothering to do it myself:

    Link

    Edit: also, differentiation is easier than integration, and you can always check by differentiating your result. You can also get Wolfram to do this too...

    Link
 
 
 
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