# AOPS Algebra 1 Online Course, Lesson 19, 03/8/2020

In today’s class, students continued to work on solving quadratic equations by factoring. In addition, understanding the sum of solutions and product of the solutions is helpful to understand the relation of solutions and equations. In solving problems, pursuing more approaches for one question can train students to open their minds and look for the efficient way. Besides the regular factorization in solving quadratic equation, students learned two special expressions for factorization, a^2+2ab+b^2=(a+b)^2, and a^2-b^2=(a+b)(a-b). These special factorization formulas are also useful in some number computing, solving algebraic questions, such as doing big number square, changing the expressions from addition/subtraction form to multiplication form, etc.
Here is the homework to cover today’s contents:
P.307, 10.3.4, 10.3.5

P.311, 10.4.3, 10.4.4, 10/4.5

P.331, 11.1.1, 11.1.2(a)(b)(c)(d), 11.1.5(a)

P.338, 11.2.1, 11.2.2, 11.2.3, 11.2.4

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