I don't really have a book to go by, and am going through examples online. I'm finding that there are certain helpful formulas. Does anyone know of a collection of formulas that I can use. For example, the difference of cubes: [tex]A^3 - B^3 = (A - B) (A^2 + AB + B^2)[/tex] It would be handy to have the sum of squares, sum of cubes, log, and formulas for working with e as well. When going through factoring, the thing holding me back is I just don't have the formulas. Thanks.