any body help me to solve that questions.
You can use disks or shells. One is easier than the other. I'd use disks.
Find the limits by equating the functions:
$\displaystyle y^{2}=y+12$
y=-3 and 4
$\displaystyle {\pi}\int_{-3}^{4}((y+12)^{2}-y^{4})dy$
Shells method is trickier.
$\displaystyle 2{\pi}\int_{0}^{9}x(2\sqrt{x})dx+2{\pi}\int_{9}^{1 6}x(\sqrt{x}-(x-12))dx$
I'll leave the actual integration to you.