Answer :
We do so to follow the rule of divisibility of each term(numbers).
The Rule of Divisibility:
The rule of divisibility of numbers is a method applied in mathematics used to determine if a number or set of numbers is divisible by a particular integer without any remainder.
Let assume that we have a series of numbers;
- 2, 4, 6, 8, 10
From the rule of divisibility, since all the numbers are multiples of 2;
We can deduce that 2 can be the factor that is pulled out from the series to divide each term in the sum.
Learn more about the rule of divisibility here:
https://brainly.com/question/840412