could u pls help me to understand the multinomial theorem?

further is this topic important ya no?

Dear student,

The following is the multinomial formula or theorem, also called the Polynomial Theorem:
[1.1]
While it looks oppressive, it is easy to prove and also easy to use. In 1.1, the a's are terms. n is an integer. The m's are the number of each term selected.
The multinomial coefficient can be written:
[1.2]

(Where the sum of the m's is equal to n).
For instance:
[1.3]

Therefore, the Multinomial Theorem can be written: