This is the distribution law of mathematics, and we can start with simple operations.

For example, a(b+c) =a*b+a*c, which means that item A must be multiplied by the next two items B and C.

For example: 2*(3+4)=2*3+2*4.

2*(3+4)=2*7= 14 (this is the original way, multiply first and then divide, then add and subtract, and add first in brackets).

2*3+2*4=6+8= 14 (this method is called the distribution law of multiplication because the brackets in the title are removed and the answer is the same as the original answer).

This problem is more advanced, that is, (a+b)(c+d)=a*c+a*d+b*c+b*d (in other words, each term should be multiplied by each other).

So (a-2)? (a-3)

=a*a-a*3-2*a+2*3

=a*a-3a-2a+6

=a*a[ or it can be written as the square of a (a 2)]-5a+6