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# could someone please check my answer for integrating v^2 dv/dt = (2+t)^3? watch

1. I have

Can't see how I would get the answer my book has:

even if I multiply everything by 12 which would give 4v^3 = (2+t)^4+a.

I used the rule not sure if that was correct because there is constant where ax is?

Thanks
2. Why did you multiply by in your right-hand integral? When using the rule

is just the coefficient of x, which in this case is 1 (not 3).
3. (Original post by nuodai)
Why did you multiply by in your right-hand integral? When using the rule

is just the coefficient of x, which in this case is 1 (not 3).
course it is, thanks! I was using n for some reason. Thank you!

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