It is more difficult. The fourth chapter of eighth grade mathematics of Beijing Normal University Edition explains factorization, which needs to turn a polynomial into the product of several algebraic expressions. The process is complicated, and many students who study this knowledge can't completely decompose it, or they can't find out what method to factorize it, so it's more difficult. Factorial decomposition can be divided into common factor method, applied formula method, grouping decomposition method, cross multiplication method, collocation method and so on.