This lesson teaches the graphical method to solve quadratic inequalities. This lesson includes various examples with various levels of difficulty. Example 9 is a common question in exams and example 10 is a more challenging type of question.
This lesson focuses on the use of "complete the square" to determine the maximum and minimum value of a quadratic equation. It will go through the steps and logic behind the steps of "complete the square". It will also show how the general formula of a quadratic equation is derived. The examples also teaches how to sketch a quadratic curve quickly after completing the square.