Answer:
The answer is "Distributive Property".
Explanation:
In order to determine the property, we have to know the result of the demonstrated. In this case, we multiplied the parentheses by four.
This action is associated to the "Distributive Property".
The Distributive Property lets we multiply a sum by multiplying each addend separately and then add the products.
For example:
2(a+b)=2*a+2*b
We multiplied by two each term inside of the parentheses. It is like the same that in this case.
Finally the property is "Distributive Property".