anyway, do you know what the disc method says?
note, you need to write the integral in terms of y, that is, you need to integrate dy. thus, find the y-intercepts and that will guide you as to how to find the limits. if you want to keep things in terms of x, you need to use the shell method, not the disk
(also, did you draw a diagram? those always help. plus, have you already posted this on physicsforums?)