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# C3 Intergration help needed watch

1. I'm struggling with question 7 from the Jun 2014 C3 paper , any help would be greatly appreciated
"Use the substitution u=3 - x^3 to find the exact value of (integral) ((x^5) / (3 - x^3)) dx"
Thanks
2. (Original post by L0014853)
I'm struggling with question 7 from the Jun 2014 C3 paper , any help would be greatly appreciated
"Use the substitution u=3 - x^3 to find the exact value of (integral) ((x^5) / (3 - x^3)) dx"
Thanks
Have you remembered to differentiate the substitution in order to swap from dx to du?

It will also help you to deal with the x^5 since x^5 = x^3 * x^2
3. Thank you! I've worked it through a bit to get
(integral) ((3-u) / (-3u)) du
And I'm unsure on how to intergrate that?

Posted from TSR Mobile
4. (Original post by L0014853)
Thank you! I've worked it through a bit to get
(integral) ((3-u) / (-3u)) du
And I'm unsure on how to intergrate that?

Posted from TSR Mobile
Separate into two fractions.
5. (Original post by L0014853)
...
http://www.thestudentroom.co.uk/show....php?t=2944667

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