Which formula calculates the volume of a solid using the shell method?
V=2π∫abxf(x)dxV = 2\pi \int_{a}^{b} x f(x) dxV=2π∫abxf(x)dx
V=π∫ab[f(x)]2dxV = \pi \int_{a}^{b} [f(x)]^2 dxV=π∫ab[f(x)]2dx
V=2π∫ab[f(x)]2dxV = 2\pi \int_{a}^{b} [f(x)]^2 dxV=2π∫ab[f(x)]2dx
V=π∫abxf(x)dxV = \pi \int_{a}^{b} x f(x) dxV=π∫abxf(x)dx