Consider the region r bounded by curves y=ax^2+3, y=0, x=0, and x=3, for a ≥minus1. let s 1 and s 2 be solids generated when r is revolved about the x- and y-axes, respectively.
a. find v 1 and v 2, the volumes of s 1 and s 2, as functions of a.
b. are there values of agreater than or =minus1 for which v 1(a)= v 2(a)?