sorry icemanfan but i couldn't see what your trying to say with that.
anyway i think i made a mistake above by leaving out the root^3
i have adjusted if someone could check please
So have I got the final answer here?
If so, I'm a little confused. Is this integration by parts?
Because the way that this is calculated doesn't go with the formula I've been taught and method.
If this is the correct final answer, can somebody explain please?
Thanks Vita X.
Thanks to everyone who contributed.
Any tips on why I got my method mixed up here?
I think the part I'm confused with is du=20x^3dx and 1/20du=x^3
It seems I am getting confused with integral products.