I use these guided notes in conjunction with Algebra Tiles. First I talk to the class about Al-Khwarizmi his life, where he lived, ect. Then I give each student his/her own set of algebra tiles and I guide the students through each of the problems. As we work, I have the students draw a diagram of the algebra tiles on their worksheets and I have the students write the factored form of the quadratic on their papers. The problems get successively harder and bring up great questions about how to complete the square. The algebra tiles add a nice visual. After about 4 problems, I ask the students to look for a pattern so that we don't have to use the algebra tiles every time (pattern is (b/2)^2.