There are three methods of factorization: collocation method, formula method and cross multiplication.

(1) matching method is the basis, so you can read the textbook in detail.

(2) How to match 2)ax? Factorization of +bx+c, the result is "directly treated as a formula"

(3)”(x+a)(x+b)= x？ +(a+b)x+ab "is used in reverse, which is" cross multiplication ".

PS:

A: After getting familiar with the principle, it is easy to get the exercises after class.

B: Just ignore the questions that are not in the book.

C: Factorization used in junior and senior high schools is very simple. With a little training, you can do it without psychological pressure.

D: When entering the university or postgraduate stage, there will be special courses to explain factorization from other angles. At this time, you will find that factorization is not generally difficult, but extremely difficult.