Question

Is this solution of mine, correct with all necessary steps in between or do I need to add more steps

Answer 1

Yes your solution is correct, I am able to follow all the steps you have taken so I don't think you need to add any more steps.

Answer 2

thanks Zed a medal for you and give me a medal for my solution :P

Answer 3

Just for the first one, you should either change u back into y and sub in the values or find out the right values to sub into u. So u=1+sqrt(y) For 4, u=3 and for 1, u=2

Answer 4

I think you need to complete the second solution because you are asked for "solids" rotating around X axis and rotating around Y axis

Answer 5

For 4, u=3 and for 1, u=2. These will be your new values to sub into the integral u

Answer 6

George then do i need to add second solution to that as well

Answer 7

by changing expresion and boundaries
\[\pi\int\limits_{0}^{8}f(y)^2dy=\pi\int\limits_{0}^{8}(\sqrt[3]{y})^2 dy\]

Answer 8

ok got it

Answer 9

thanks guys love you