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# C4 Integration by substition Watch

1. (Original post by BananaPie)
Let u = 2+x

Now ur equation becomes (u-2)(u)^3 du. U can easily multiply that in and integrate.

A general rule for an equation like that is that u substitute the one within the bracket that has the indicy. E.g (5x+4)^5 let u = 5x+4. Do not include the indicy though
This is not the given substitution, nor would it help in this instance.
2. (Original post by joostan)
This is not the given substitution, nor would it help in this instance.
I was replying to the person who posted above me. Forgive me, I forgot to use the quote function
3. (Original post by BananaPie)
I was replying to the person who posted above me. Forgive me, I forgot to use the quote function

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