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# AQA C3 Integration by parts help!!! Please watch

1. Does anyone know how to do these question using integration by parts

1). x(4-x)^3

2). (x-1)(x+2)^2

Thanks!
2. I personally would just expand it out. Quicker and easier.
3. For 1) let u=x and u'=1 (always make one of the terms simpler) let V'=(4-x)^3 and V=(4-x)^4/4. You differentiate one of the terms and you intergrate one of the terms
You then substitute the values into the formula uv-intergral of V.u' (multiply V by u' before you intergrate the term)
Hope you understand it now
4. Yes thank you!

Idk why but I keep getting the part where u find the (integral of v multiplied by du/dx) wrong

For example question 1d) x(2x+5)^5

If you don't mind doing the question it would be great 😅
5. (Original post by Fluffystar123)
Yes thank you!

Idk why but I keep getting the part where u find the (integral of v multiplied by du/dx) wrong

For example question 1d) x(2x+5)^5

If you don't mind doing the question it would be great 😅
I got 1/168(12x-5)(2x+5)^6 + c

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Updated: November 1, 2015
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