Hi,

I have a problem in an area in which I haven't used since high school (all those years ago).

My boss wants me to be draw a chart with a nice compounding curve over 3 years. To do this, he has given me three values - lets say (1,30), (2,70) and (3,100).

When I plot the graph, it appears as just three straight lines joined together. However, we want it as a parabola - i.e. compounding toward the end and looking smoother.

My question is this: is there a way to determine the correct formula of a quadratic if you know three points of it? In other words, how does this graph look in the form of:
y=ax2 + bx + c
?

Any help would be great.

Rodney