Q: Find the volume of the solid formed by

z=x^2 +y^2 and z=2y-4x+1

i think im supposed to do cylindrical coordinates.

i got the limits for z and theta

but not for r

my limits were

z: r^2 => 2rsin(theta) - 4rcos(theta) +1

Theta: 0 => 2pi

CAN U HELP ME PLZ? THANK YOU