Videos
http://www.mathmeeting.com/algebra-videos/factoring-trinomials/#sthash.69hPB4Mv.dpbs
https://www.youtube.com/watch?v=tsZgPLvgo7U
https://www.youtube.com/watch?v=sCdY3zu-cio
https://www.brightstorm.com/math/algebra/factoring-2/factoring-trinomials-a-equals-1/
https://www.youtube.com/watch?v=BlTcuLNzM3c
https://www.youtube.com/watch?v=cWapvAWXdoY
Practice Activities & Worksheets
http://www.mesacc.edu/~scotz47781/mat120/notes/factoring/trinomials/a_is_1/trinomials_a_is_1.html
http://www.wallace.ccfaculty.org/book/6.3%20Trinomials%20a=1.pdf
https://cdn.kutasoftware.com/Worksheets/Alg1/Factoring%201.pdf
https://www.ixl.com/math/algebra-1/factor-quadratics-with-leading-coefficient-1
https://www.chilimath.com/lessons/intermediate-algebra/factoring-trinomial-easy-case/
http://www.hanlonmath.com/pdfFiles/518FactoringTrinomialsa1.pdf