(1) square difference formula
formula for the difference of square
(2) Complete square formula
Perfect square trinomial
factoring
Factorization is an important identity deformation of algebra. The common methods involved in junior high school textbooks mainly include: extracting common factors and formulas (square difference formula and complete square formula). Factorization and algebraic expression multiplication are opposite deformations, which play an important role in fractional operation, solving equations and various identity deformations, and are an important basic skill.
Multiplication formula
formula
The deformation of algebraic expression is an important deformation of algebraic identity and an extremely common operation in high school mathematics.
Junior high school requires to understand the concept of algebra, and will perform simple algebra addition, subtraction, multiplication and division (polynomial multiplication only refers to one multiplication); Will use square difference and complete square formula for simple calculation; Factorization (the exponent is a positive integer) will adopt common factor method and formula method (the formula will be carried out directly for no more than two times).