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
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.
Sep 2nd 2009, 05:22 AM
I believe 2pi/15 is correct
Draw a diagram and you'll see you need 2 integrals