university levels of education Algebra I — IV▊

Four levels in one page, from the first negative number to the rational root theorem — handmade, no ads, no sign-ups. A hundred and twenty topics and one thousand four hundred and thirty-two problems, every one of them carrying a full worked solution laid out step by step, a written lecture for every one of the hundred and twenty topics, and ten ways to study the same material. Start at whichever level you need; it is all one file, and the last entry opens the whole subject at once.