Let R be the region in the first quadrant bounded by the curves y = f(x) = 2x+ 1 and y = g(x) = 2x^2 − 8x + 9

Find the volume of the solid obtained by rotating the region R about y-axis using two dy-integrals.enter image description here

1) i am in trouble when he is asking to use two dy integral. I guess 1 to 3 and 3 to 9 it should be.