$\displaystyle y = \dfrac{x^2}{25} , x = 3 , y = 0 $

Find the volume V of this solid.

rotate around the Y-axis.

do i use the disk method and use the equation

$\displaystyle v = \displaystyle\int^3_3 \pi r^2 dx$

the bottom of the integration symbol is supposed to be a negative 3, not positive, i don't know how to fix it on here.

Thanks!