If you search for "Polynomials by Barbeau pdf", you will find links. Many are on university repositories (legal) or shadow libraries (gray area).
My advice: Check your local library’s digital lending (like Internet Archive) or your university’s Springer subscription first. The physical book is often out of print or expensive, which is why the PDF is so popular. If you find a free copy, consider it a loan; if it changes your mathematical life, buy a used hardcover to support the legacy. polynomials by barbeau pdf
You can find a preview of "Polynomials" by Barbeau on Google Books. While you cannot download the whole thing, you can often read the first 20–30 pages (the introduction and first problem set) for free to see if the style suits you. If you search for "Polynomials by Barbeau pdf"
When searching for "polynomials by barbeau pdf," beware of: Unlike standard textbooks that present theory followed by
Unlike standard textbooks that present theory followed by repetitive drills, Barbeau’s "Polynomials" takes a dialectic approach. The book is organized around problems and explorations. Each chapter begins with fundamental facts but quickly escalates to challenging, open-ended questions.