• July 18th 2006, 01:02 PM
m777
any body help me to solve that questions. :confused:
• July 18th 2006, 02:33 PM
galactus
You can use disks or shells. One is easier than the other. I'd use disks.

Find the limits by equating the functions:

$y^{2}=y+12$

y=-3 and 4

${\pi}\int_{-3}^{4}((y+12)^{2}-y^{4})dy$

Shells method is trickier.

$2{\pi}\int_{0}^{9}x(2\sqrt{x})dx+2{\pi}\int_{9}^{1 6}x(\sqrt{x}-(x-12))dx$

I'll leave the actual integration to you.
• July 19th 2006, 09:04 PM
aziz101
thanks,
Thanks for correcting me Galcutus. i would try myself next. !!
• July 20th 2006, 04:37 PM
Quick
Quote:

Originally Posted by aziz101
Thanks for correcting me Galcutus. i would try myself next. !!

Are you the same person as m777?