I have a set of data, which I charted and then used the 'add trendline' tool to get a decent 2nd order poly. fit with the equation: y = -3E-39x^2 + 4E-19x + 3.4212 However, when I type this equation ...

Trying to predict the future based on past experiences, but you're lacking the right formula? If you've forgotten high school algebra, fear not. With trendlines, Excel can project future figures based ...