You may want to check Andy Pope's
http://www.andypope.info/charts/intersection.htm



On Wed, 23 Jul 2008 19:46:01 -0700, Derick C.
wrote:

How can I calculate the intersection point in Excel where two parabolic
curves intersect? Take the following data as an example:

Y1 22 22 21 21 20 19 16
Y2 15 15 17 18 21 25 29
X 0 43 86 129 171 214 257