Grouping decomposition is a complex factorization method, so we must be predictable. Predictably, the next step can continue to decompose. And "foresight" comes from careful "observation" Analyzing the characteristics of polynomials and grouping them properly is the key of grouping decomposition method.

Grouping factorization factorization can not only investigate the common factor method and formula method, but also play an important role in the simplification and evaluation of algebra and the learning of quadratic equations and functions.

There are four or six or more terms in the equation that can be decomposed by groups. Generally, there are two forms of group decomposition: 2+2 division and 3+ 1 division.