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# FP3 Integration watch

1. Hi Guys

The picture attached is the mark scheme of a Fp3 past paper Q4 June 2010. I don't understand the first line, that why it's is a + sign rather than a - sign in the middle of the equation? I know this integrate by part, according to the by part formulae, I think it should be a -sign. Can anyone explain to me thanks.

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2. when you differentiate a - x you get a minus ?
3. Differentitate (a-x)^n and you get -n(a-x)^n-1 not n(a-x)^n-1
remember the bit inside the bracket gets differentitated as well
4. (Original post by Luciferr)
Differentitate (a-x)^n and you get -n(a-x)^n-1 not n(a-x)^n-1
remember the bit inside the bracket gets differentitated as well
Thanks, I forgot about the chain rule. I understand now thanks so much

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5. (Original post by the bear)
when you differentiate a - x you get a minus ?
Thanks. I forgot apply chain rule. I get it now.

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Updated: March 25, 2016
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