Section 1.5 Algebra and Trigonometry
Read Sections 1.4.5: Performing Operations on Polynomials of Several Variables - Pages 74-75. (10 minutes)
OpenStax College, Rice University - 2015
Click https://web.archive.org/web/20201005033700/https://lib.alfaisal.edu/pdf/AlgebraAndTrigonometry-LR.pdf link to open resource.