Posted by **Andrew** on Tuesday, December 16, 2008 at 8:30pm.

washer method!?

Find the volume of y=x^2+3, y=3, between [0,2] around y=3

- Calculus -
**Reiny**, Tuesday, December 16, 2008 at 8:35pm
make a sketch

wouldn't your volume be the same if you rotated y = x^2 around the x-axis, for [0,2] ??

I am sure you can do that easy one.

let me know what you got.

- Calculus -
**Andrew**, Tuesday, December 16, 2008 at 8:38pm
No it wouldnt be the same because one is a disk rule one is a washer rule

- Calculus -
**Reiny**, Tuesday, December 16, 2008 at 8:51pm
you are rotating it around y=3, so there is no hole.

- Calculus -
**Andrew**, Tuesday, December 16, 2008 at 9:05pm
your right im sorry, i was thinking we were rotating around x=3 lol but will you do it so i can check my answer?

- Calculus -
**Reiny**, Tuesday, December 16, 2008 at 9:26pm
I got 32pi/5

- Calculus -
**Andrew**, Tuesday, December 16, 2008 at 10:20pm
i think u forgot to add the 2x^3 to the antiderivitive for the fundamental theorm step

- Calculus -
**jack**, Tuesday, December 16, 2008 at 10:41pm
nm

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