In Ontario, the Grade 10 Academic Math course is taught using either the McGraw-Hill textbook or the Nelson Principles of Mathematics 10 textbook. The content is 95% identical (same curriculum, same chapters).
The Nelson textbook is widely available for free as a PDF because the publisher previously hosted it publicly.
If you type the exact keyword into Google, you will find a mix of results: torrent sites, file-sharing forums (like Reddit or GitHub), and "free textbook" repositories. Here is the reality check:
Key concepts:
Deep strategy:
Example: A ball thrown: h(t) = –5t² + 20t + 2. Find max height: complete square or use t = –b/(2a).