# Monthly Archives: April 2020

## AOPS Algebra 1 Online Course, Lesson25 , 04/26/2020

Today, students continued to study one-variable quadratic inequality with the non-factorable quadratic expression and real solutions or with the non-factorable expression and non-real solutions. The key is how to write a quadratic expression in factor form from the roots of … Continue reading

## Singapore Math 8th Online Class, Lesson 24, 04/19/2020

Today, students studied another two methods to solve quadratic equations, “completing the square” and “quadratic formula”. In fact, quadratic formula is derived in solving standard quadratic equation, ax^2+bx+c=0, by using “completing the square”. Both methods are so powerful that all … Continue reading

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## AOPS Algebra 1 Online Course, Lesson24 , 04/19/2020

Today, students studied writing quadratic equations and solving quadratic inequality with one variable. Writing equations requires at least three conditions and selects proper quadratic form to find the values that need to complete the equation, such as standard form and … Continue reading

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## AOPS Algebra 1 Online Course, Lesson23 , 04/05/2020

Today, students studied the graph of quadratic equations y=ax^2+bx+c and understand the feature of the graphs in the shape of “parabola”, such as, leading coefficient “a” determines the graph open direction, upward or downward, vertex point represents the minimum point … Continue reading