Question

volume of x=-y^2+4y-2 and x=y^2-4y+4 using shell method and ring method

Answer 1

bounded by both curves and revolving about x?

Answer 2

disc:
\[V = \pi\int_{y=a}^bx^2 dy
\]
shell:
\[V=2\pi\int_{y=a}^bxy dy
\]