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Precalculus is free to students while meeting the high-quality bar required of a college textbook. We could have published through a traditional publisher, making shareholders of the publisher some sweet money. Instead, we decided to go the open-source route, because we understand that expensive textbooks are a barrier to education and social mobility.

Extra benefits of using an OER textbook like this one vs the expensive alternatives:

Every student can access the textbook, even before the course starts, for free.
The 2-part black-and-white paperbacks for this book are available for under $30 on lulu.com. FYI: The book is broken into smaller books because print-on-demand services only allow a book to have 800 or fewer pages. (Paperback distribution via Amazon is also coming soon.)
Students have forever access to the textbook PDF, including future editions, for free.

Teachers: register at openintro.org/register to get access to teacher-only content, including the option to get a free desk copy (US-based only).

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Kick off your book project, get started with GhostAI, get better at marketing, or spend the day doing all three! Free live workshops on Zoom. Saturday, June 27, 2026.

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