# Monthly Archives: January 2020

## AOPS Algebra 1 Course, Lesson 17, 01/19/2020

Today, I started the new chapter, quadratic equations, basic nonlinear, but very important, expressions and equations. I introduced the basic concepts of quadratic expression and equations, and the methods to solve the quadratic equations with coefficient of quadratic term being … Continue reading

## AOPS Algebra 1 Course, Lesson 16, 01/12/2020

Today, students continued to study the linear inequality, solving one variable inequality, three ways to represent inequality solution, inequality notation, interval notation, and number line; For two-variable inequality, graphing is used to present the solutions because the solution is zone … Continue reading

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## Singapore Math 8th Class, Lesson 16, 01/12/2020

Today, students finished congruence and similarity study and started to work on parallel lines and transversal. In the similarity, one of the transformation, the enlargement, was introduced. The center of enlargement and scale factor are two key information to determine … Continue reading