the associative property is used.
Which property is used in the expression?
The Associative property of multiplication says that (a × b) × c = a × (b × c),
so we can perform the multiplication in any order we want.
If you look at the expression:
(9x3)x4=9x(3x4)
The difference is that first we start with the product 9×3, and in the right side the first product we need to solve is 3×4, so the associative property is used.