I am required to find the radius of convergence for the function $$f(x) = 5x^3 - 6x^2 - 7x + 6$$ by first finding its Maclaurin series.
I found the Maclaurin series to be $$ 6 - 7x -6x^2 + 5x^3...$$
I am having trouble figuring out what the summation form notation of this series should look like. I would need this to apply the ratio test and find the radius of convergence.
Some guidelines on figuring out the summation notation for any such series would also be appreciated. Thanks!