Also if some1 can help me in this question that would be great.

Find the equation of the tangent to the parabola y=2x^2 at (1,2). Calculate its point of intersection with the x-axis and the volume of the solid formed when the area between the parabola, the tangent line and the xaxis is reveloved about the xaxis.

Especially the bit about forming a solid of revolution.

The tangent, has equn of

y=4x-2

THe pt of intersection is (1/2,0)

But the area formed i found to be 2/15 pi, which is different to the answer. Much help would be appreciated.