This foldable can be used with interactive notebooks or on its own. You can edit the file to allow for functions other than quadratic. You can also edit the a, h, and k information so that students can fill it in completely on their own or fill-in-the blank notes. The file looks like the words are written upside down on the second page; but when printed, it folds and read correctly.
This works great with quadratics and absolute value functions.