Polynomial operations, binomial theorem, and finding rational roots.
He packed his bag and walked up to the front desk. Mr. Vance was stamping date cards.
The non-profit (archive.org) practices Controlled Digital Lending. They scan physical copies and lend them to one user at a time, just like a physical library. Search for the textbook there. You may need to wait if all copies are checked out, but it is 100% legal and free. You "borrow" the PDF for 1-2 hours or 14 days, depending on the policy.