Explanation:
the bounded region is from (0,0) to (1,1)
since the cross sections of the solid is perpendicular to the x axis and are square
so cross section area is (x-x2 )^2
so V=integral from 0-1(x-x^2)^2dx
v=integral (x^2-2x^3+x^4)dx
v=1/3x^3-1/2x^4+1/5x^5]01
v=1/3-1/2+15=1/30 unit^3