The way that you would do this is by taking 
out of the binomial, or as I like to think about it, 'un-distributing'. :p
out of 
, you end up with 
.
When you take out of 
, you get 
.
Put it together, and the solution is - 
.
Hope I helped!!
When you take
Put it together, and the solution is
Hope I helped!!