Im not sure how to find the limits of this

Set up an integral to find the volume of the solid below the graph off(x,y) = 49 -x2 -y2 and above the planez= 9.

i think the equation becomes x^2+y^2=40 and the x limits are -sqrt(40) to sqrt(40) but im not sure. could someone please explain to me how i get the limits.

thanks!