The explanations in this book are very technical, and it throws a lot of concepts at you full speed. I know what a function is from other books and other math classes I've taken, but here is their definition, "A function associates every number in some set of real numbers, called the domain of the function, with another real number." If that sentence didn't make your thoughts wander as you read that, then maybe this book is for you, but if you had to read it a few times to process it like I did, then you're better off learning pre-calculus from another book unless this is the required text for you class. Even though the theory isn't explained in an engaging way, there are many examples, and the solutions are worked out thoroughly. But then again, whats the point of merely following and memorizing formulas if you don't fully understand what you're doing. I don't believe math has to be boring, but this book makes it very much so.