I.
polynomial
I-1.
Operation of polynomials
Lesson 1: Addition and Subtraction of Polynomials
Lesson 2: Multiplication of Polynomials
Lesson 3 Multiplication Formula (1)
Lesson 4 Multiplication Formula (2)
Lesson 5: Transformation of the Multiplication Formula
Lesson 6 Division of Polynomials
I-2.
Remainder theorem and factorization
Lesson 7: Identity
Lesson 8 Remainder Summary
Lecture 9: Factoring and Assembly Methods
Applying the Factoring Formula in Lesson 10
Lesson 11: Slightly Complex Factorization
The ultimate factoring master, factoring using the factor theorem.

II.
Equations and Inequalities
II-1.
Complex numbers and quadratic equations
Lesson 13 Complex Numbers, Who Are You?
Lesson 14: Arithmetic Operations on Complex Numbers
Lesson 15: The Counterattack of the Imaginary Unit [Square Root of a Negative Number]
Lesson 16: Quadratic Equations and Discriminants
Lecture 17: The Relationship Between the Roots and Coefficients of Quadratic Equations
II-2.
Quadratic equations and quadratic functions
Lesson 18: Graphs of Quadratic Functions
Lecture 19: The Relationship Between Quadratic Equations and Quadratic Functions
Lesson 20: Positional Relationships Between the Graph of a Quadratic Function and a Straight Line
Lesson 21: Maximum and Minimum of Quadratic Functions
II-3.
Various equations
Lesson 22: Cubic and Quaternary Equations (1)
Lesson 23: Cubic and Quatric Equations (2)
24th lecture: Simultaneous quadratic equations
II-4.
Various inequalities
Lesson 25: Linear Inequalities
26th lecture: Simultaneous inequalities
Lesson 27: Inequalities Including Absolute Value Signs
Lesson 28 Quadratic Inequalities